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EDWARDS PAGE 16-1

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FM TUNER EDWARD'S FM RADIO CORP.

In most metropolitan locations an indoor antenna may be all that is necessary. This by all means should be tried first, unless a suitable F.M. type outdoor antenna is already available. A very satis- factory indoor antenna may be improvised from a piece of 300 ohm flat type transmission line. (Same material as the antenna connection coming out from the tuner.) Cut the piece to a length of 60 inches. Then short circuit both ends. Then in the exact center cut one side of the line and use the two re-

sulting ends to connect to the antenna line coming from the tuner. The antenna may be fastened to a molding or to a piece of wood with thumb tacks. (See diagram.) It is also advisable to try position- ing the antenna at various angles and positions, so as to favor most desired stations. This applies to an outdoor antenna as well.

FOLDED DI -POLE ANTENNA

LDER SOLDER

2d' ! 29.,

MATERIAL; 300r, LINE

ANY LENGTH TO RECEIVC. R

OLDER

If this indoor antenna should prove unsatisfactory for your location, any standard half wave di- pole F.M. outdoor antenna may be used. A 300 ohm transmission line should be used to couple to the tuner.

Any high quality audio system may be employed. Connection can be made to the phono connection provided for on most better radio receivers. Volume may be controlled either directly at the tuner by means of the volume control provided for on the receiver or amplifier, whichever is more convenient. A phono imput is provided in the rear of the tuner. The selector switch in the front may be used to switch from F.M. to phono, all connections then being permanent. If desired an A.M. tuner may be connected to the rear phono jack instead of a phono pickup.

After the tuner is in operation for about 10 minutes each time it is turned on it may be necessary to retune to compensate for a slight temperature rise drift. This will not be necessary thereafter. Tun- ing should be so done as to get maximum closing of the target on the 6U5 tuning eye mounted directly on the dial. However the ear should be the final judge of the exact dial position. This point will always he in the region of maximum tuning eye closing.

The output line is high impedance 500,000 ohms. It should he ascertained that the 6J6 and 6AG5 miniature tubes mounted under the chassis are

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ELECTR. LABS. PAGE 16 1

©John F. Rider


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ELECTR. LABS. PAGE 16-3


. I.F. ALIGNMENT PROCEDURE

1. Feed I.F. frequency from the signal generator through a 0.01 mfd condenser to the oontrol grid of the R. F. tube.

2. No signal will be heard unless trimmer oondenser under chassis is unscrewed and reduced from original setting.

3. Turn volume oontrol full on.

4. Make preliminary I.F.adjustment with signal level approximately 50 Mv.

5. Tune I.F. trimmers for maximum signal, reducing I.F. signal input to coupling loop to keep output voltage less than 0.5 V.

6. When maximum output has been secured, adjust trimmer condenser in the I.F. trap (under chassis) by turning clockwise to the minimum signal.

C. R.F. ALIGNMENT PROCEDURE

1. Volume oontrol full on.

2. Adjust tuning unit to top stop position.

3. Feed 1620 ko signal into external loop. Hold audio output below 0.5 V. Adjust the oscillator trimmer condenser to maximum output.

4. Move slugs in by means of tuning dial so that pointer is approximately 1" from the stop end, and a

signal received from the external loop on a frequency of 1400 ko. Adjust lower trimmer (R.F. trimer) to maximum output. Reduce R.F.input to keep signal output voltage below 0.5 V.

5. Rotate tuning shaft until poidm r is approximately 1" from the other end of the scale. Feed to the external loops test signal at 700 ko. Adjust the R.F.00il slug by rotation in the Tinnerman nut to maximum output.

NOTE: Alternately adjust R.F. trimmer and R. F. slug until maximum output is reached at both 1400 KC and 700 KC as instructed in paragraphs C4 and C5.

CAUTION: Extreme care should be taken in the 700 ko. position to make sure that the tuner carriage is not moved by the adjusting tools or hand pressure on the slug screw. Carriage should not be held against the frame, but should be allowed to assume its normal position when adjusting the k.F. coil slug.

SPECIFICATIONS

Power consumption 35 watts (At 117 volts AC Supply)

Power Output- 1.1 Watts 10% Distortion

1.6 Watts Max. Selectivity ----49 KC Broad at

1000 times Signal Intermediate Frequency 455 KC Speaker 4"x6" Oval

Tuning Frequency Range..540 to 1620 KC Sensitivity (For .05 Watt output -exter-

nal Antenna) 15 microvolts average

Radio Utiliphone, MODEL 76RU, Chassis 2865

Volume Co

Allow Cha "Heat

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ALIGNMENT PROCEDURE trol-Maximum All Adjustments.

sis and Signal Generator to

p" for several minutes.

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for Aligning:

Signal Generator whi an accurately cal test frequencies a

Output Indicating Met Screwdriver.

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FREQUENCY SETTING

I.F.

4175 KC

GNAL GENERATOR ANTENNA CONNECTION COUPLING

Grid of RF tube 14A7

Ground generator

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DUMMY ANTENNA

0.01 mfd

TUNER SETTING

TRIMMER ADJUSTMENT (SEE DIAGRAM)

Out Adjust for Max. 1, 2,

3 and 4

NOTES

I.F. 455 KC

Grid of RF tube 14A7

Ground generator

to chassis

0.01 mfd Out Trim condenser under chassis for Min.

output.

If it is found that regeneration prevails when the loop antenna is put in its normal position close to the tubes, then the under chassis trimer is incor- rectly set, and should be adjusted to prevent the regenerative condition.

1620 KC Inductive Coupling to Loop

Loop coupling with leads brought out

400 ohms in series with Antenna & Gnd.leads

Out Adjust Oso.

#5 for Max. Signal


Loop coupling with leads brought out


Dial set

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Loop Coupling with leads brought

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Adjust RF tuning core #7 for Max. Signal(care should be taken not to disturb carriage position of tuner)

Alternately adjust R.F. trimer and R.F.slug until maximum output is reached at both 1400 KC and 700 KC as

instructed above.

DRIVE CORD REPLACEMENT

Turn the tuner to the fully open position. Use a new cord 41" long and tie one end to the tension spring. Fasten the other end of the tension spring to the drive pulley. Pass cord through slot in pulley ring; add spring tension and continue one and one-half turns counterclockwise over top of pulley. Then pass cord around idler pulley A, starting over top and going around clockwise. Pass cord over idler pulley B, starting over top and going around counter clockwise. Wind one full turn counterclockwise around drive mechanism. Then wind'one full turn counterclockwise around drive pulley, pass through slot in pulley and tie string to tension spring. Cut off excess string.

Attach dial pointer to cord.

DRIVE PULLEY

TENSION SPRING

-DRIVE MECHANISM

©John F. Rider


PAGE .16-4 ELECTR. LABS.

MODEL 76RU ELECTRONIC LABORATORIES, INC.

SUB -STATION NO.I ABCD ®

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INSTALLATION CONNECTION, MODEL 76RU RADIO-UTILIPHONE AND MODEL 7S SUB -STATIONS

SUB -STATION NO.2 ABCD ®®®

REMOVE THIS JUMPER BEFORE ADDING SUB -STATION NO.2

REMOVE THIS JUMPER BEFORE ADDING SUB -STATION NO.3

0 T ® REMOVE

THIS JUMPER BEFORE ADDING SUB -STATION NO.4

AB CD

A BCD SUB -STATION NO.3

SUB -STATION NO.4 TO CONNECT TWO OR MORE SUB -STATIONS

The Model 76RU Radio-Utiliphone is supplied, by the manufacturer, set up to operate one sub -station. If more, than one sub -station is to be installed, be sure to read all instructions before starting to connect the stations.

Terminalboard on the 76RU, is marked 1, 2, 3, 4, and A, B, C, D. The numbers 1, 2, 3, and 4 indicate stations, the letters A, B, C and D indicate the four terminals which are to be used for connections to the sub -stations.

Stations must be connected in sequence as marked. IF ONLY ONE STATION IS TO BE

USED, IT MUST BE CONNECTED TO THE SET OF TERMINALS MARKED "1".

THE SAME SIRE MUST BE CONNECTED BETNEEN TERMINALS HAVING THE SAME MARKINGS: -

Terminal lA (on Model 76RU) to Terminal A on No. 1 Sub -Station Terminal 1B (on Model 76RU) to Terminal B on No. 1 eub-Station Terminal 1C (on Model 76RU) to Terminal C on No. 1 Sub -Station Terminal 1D (on Model 76RU) to Terminal D on No. 1 Sub -Station

Be certain that jumpers R, S, and T are in place per diagram.

LINE VOLTAGE Model 76RU Radio Utiliphone operates

only on a power supply of 105-125 volts

AC, 50 to 60 cycles, or 105-125 volts

DC. If in doubt about your line volt-

age,oheok with your local power company

before connecting the Radio-Utiliphone. If there seems to be an excessive

amount of hum when operating the radio on AC, reverse the position of the line plug in the socket.

On DC operation, if the radio does

not operate within one minute after it

is connected, reverse the position of the line plug in the socket.

Model 7S Sub -Station requires no

electrical power oonneotion.

LOCATION If two units are located in the same

room and are too close together, they

may "sing" due to acoustic feedback. By experimenting, it is possible to change

the position of the units to that this

feedback is eliminated.

TUBES AND DIAL LAMP The type and position of tubes are

shown in illustration. All tubes and the dial lamp MUST be

in the sooket to operate the radio- utiliphone.

CAUTION - If a dial lamp burns out,

it should be replaced at once. A hole in the bottom of the cabinet provides access to the dial lamp so that it may be replaced without removing chassis from the cabinet.

Use only a #47 dial lamp.

14Q7 14A7 14F7 ete..

rillskii5"5 354

Model 76RU Radio-Utiliphone and

Model 7S Sub -Stations are interconnected by using the four -conductor wire furn-

ished. (Additional lengths, up to ap-

proximately 500 feet may be used. This

is available in 50 foot lengths.) The

wire supplied with the equipment is

color coded for convenience in making connections. Connections on each unit are made to screws on the terminal boards provided. (See connection diagram.)

The terminal board on the Sub -Station

is located on the back of the cabinet,

and on the radio-utiliphone, it is lo-

cated on the back of the chassis inside

of the cabinet. Remove four screws in

the corners of the back cover. The back

cover may then be pulled away from the

cabinet far enough tc permit access tc

the terminal board. .,ires must be Olean and free of in-

sulation before making connections. To

insure a good connection,the wire should

be wrapped completel around the screen

terminal. Screw should then be tightened

so that wires are held securely in place. Faulty connections of any kind may in- terfere with operation.

TO CONNECT ONE SUB -STATION

Sub -Stations must always be connected in sequence as marked on the terminal board. If two sub -stations are used, they must be connected to the terminals marked "1" and "2". Before connecting station No. 2, remove jumper "R" (refer

to connection diagram). Than connect wires between terminals #2A, #2B, #20, and #2D and Terminals A, B, D, and D of

No. 2 sub -station. IF ONE STATION IS LATER REMOVED, THE REMAINING STATION MUST THEN BE CONNECTED TO THE TERMINALS MARKED "1", AND JUMPER "R" MUST BE RE-

PLACED.

Three sub -stations must be connected to terminals #1, #2 ánd 43. Before connecting station #3, remove jumper "S"

(refer to oonrection diagram). Thon

connect wires between terminals #3A, #3B, -#3C and #4D, and terminals A, B,

C, and D of No. 3 sub -station. If the third station is later removed, the two remaining stations must be connected to terminals marked "1" and "2", and jumper "S" must be replaced.

Before connecting station No. 4,

remove jumper "T" (refer to connection diagram). Then oonneot wires between terminals #4A, #4B, #4C, and #40, and terminals A, B, C, and D of No. 4

sub -station. If fourth station is

later removed, the three remaining stations must be conneoted'to termini als #1, #2 and #3, and jumper "T" must be replaced.

©John F. Rider



ELECTRONIC LABORATORIES, INC. MODEL 710T, Orthosonic,

Chassis 2875

©John F. Rider


6 ELECTR. LABS.

MODEL 710T


DIAL Standard Broadcast Band. 540 to 1620 Kilocycles. Calibrated in channel numbers. Add a zero to the dial number to obtain the kilocycle number.

VOLUME, ON -OFF Turn knob to the right to turn radio on. A click will be heard - wait 30 seconds for tubes to heat. Continue to turn the knob to the right to increase the volume.

This control ants as a master volume control after treble and bass response has previously been set by the trebl and bass controls. If the treble and bass controls are both turned completely off (counter -clockwise) there will be no volume to the final amplifier and therefore no sound will be heard.

T U N I N G Turn knob until desired station is heard. Rotate slowly back and forth until signal is strongest and clearest. Reduce or inbrease signal by using the volume control.

BASS This control adjusts the volume output from the bass amplifier. For balanced reoeption, this control should be turned completely on (clockwise). If less than normal is desired, the bass response can be lowered by turning the knob counter -clockwise until desired response is obtained.

TREBLE This control adjusts the volume output from the treble amplifier. For balanoed reception, this control should be turned completely on (clockwise). If less treble response than normal is desired, or if unusually noisy reception conditions are eencountered, this control should be turned counter-olookwise until desired response is obtained.

TREBLE AND BASS CONTROLS Since these controls actually regulate the volume output of separate channels, it should be noted that if both bass and treble controls are turned to the off position, there will be no output from the speaker regardless of the position of the master volume control.

TUBES AND DIAL LAMP The type and position of tubes are shown in illustration.

All tubes and the dial lamp WUST be in the socket to operate the radio.

CAUTION - If a dial lamp burns out, it should be replaced at once. A hole in the bottom of the cabinet provides access to the dial lamp so that it may be replaced without removing chassis from the cabinet.

Use only a No. 47 dial lamp

I2S K 7GT/G 35Z5GT/G

*urrir2idit 12SA7GT/G 12SQ7GT/G

50L6GT/G

ANTENNA A High Q Loop Antenna is built into the cabinet of the glectronia Model 710T Orthosonio Radio. No other antenna is usually required for reception of local or powerful stations. Since directional effects are obtained by using only the built-in loop antenna, the signal pickup may be increased and interference from nearby stations decreased, by changing the position of the radio until the signal is at a maximum.

LINE VOLTAGE Electronic Model 710T Orthosonic Radio operates only on a power supply of 105-125 volts A.C. 50 to 60 cycles, or

105-125 volts D.C. If in doubt about your line voltage, oheok with your local power company before connecting the radio.

If there seems to be an excessive amount of hum when operating the radio on A.C.,.reverse the position of the line plug in the socket.

On D.C. operation, if the radio does not operate within one minute after it is connected, reverse the position of the line plug in the socket.

MECHANICAL NT:- The following mechanical adjustments should be madede before alignment:

1. Rotate shaft of tuning unit until carriage is against top stop position.

2. Space oscillator coil slug 1-5/32" out from top of oscillator coil form.

3. Space R.F. coil slug 1-29/64" out from top end of R.F. coil winding.

(Note: -The distance 1 and 2 should be measured from mounted end of the slug)

4. Adjust screw on trimmer of wave trap towards open position so that condenser plates are open at least 1/32".

FIRST I.F.

CONTROLS

5

6

55 60 70 90 110 130 150 150 I- j", . ". . . . "_". ".. " . _ . ._a

CRTI-10 AP,_

f01)11L

7(R.F.COIL)

SEE NOTE (OSCILLATOR COIL)

3SECOND I.F.

4

©John F. Rider



MODEL 710T ELECTRONIC LABORATORIES, INC.

I.F. ALIGNMENT PROCEDURE

1. Feed I.F. frequency from the signal generator through a 0.01 mfd condenser to the control grid of the R. F. tube.

2. No signal will be heard unless trimmer condenser under chassis is un- eorewed and reduced from original setting.

3. Turn volume control full on.

4. Make preliminary I.F.adjustment with signal level approximately 50 Mv.

5. Tune I.F. trimmers for maximum signal, reduoing I.F. signal input to coupling loop to keep output voltage less than 0.7 V.

6. When maximum output has been secured, adjust trimmer condenser in the I.F. trap by turning clockwise to the minimum signal.

R.F. ALIGNMENT PROCEDURE

1. Volume control full on.

2. Adjust tuning unit to top stop position.

3. Feed 1620 kc signal into external loop. Hold audio output below 0.7 V. Adjust the oscillator trimmer condenser to maximum output.

4. Move slugs in by means of tuning dial so that pointer is approximately 1" from the stop end, and a

signal received from the external loop on a frequency of 1400 ko. Adjust lower trimmer (R.F. trimmer) to maximum output. Reduce R.F.input to keep signal output voltage below

0.7 V.

5. Rotate tuning shaft until pointer is approximately 1" from the other end of the scale. Feed to the external loops test signal at 700 ko. Adjust the R.F.coil slug by rotation in the Tinnerman nut to maximum output.

NOTE: Alternately adjust R.F. trimmer and R.F. slug until maximum output is reached at both 1400 ko. and 700 kc. as instructed in paragraphs C4 and C5.

CAUTION: Extreme care should be taken in the 700 kc. position to make sure

that the tuner carriage is not moved by the adjusting tools or hand pressure on

the slug screw. Carriage should not be held against the frame, but should be

allowed to assume its normal position when adjusting the R.F. coil slug.

SPECIFICATIONS over consumption 60 Watts

(At 117 volts AC Supply) over Output- 3.5 Watts Max.

2.5 Watts 10% Distortion electivity ----45 KC Broad at

1000 times Signal ntermediate Frequency 455 KC

peakers 4}" PM Dynamic 6" PM Dynamic

ning Frequency Range 540 to 1620 KC ensitivity (For .05 Watt output -exter-

nal Antenna) 10 microvolts average

ALIGNMENT Volume Control -Maximum All Adjustments.

Allow Chassis and Sigal Generator to "Heat Up" for several minutes.

The equipment in column at right is required for Aligning:

PROCEDURE Signal Generator which will provide

an aoourately calibrated signal at test frequencies as listed.

Output Indicating Meter; Non -Metallic Screwdriver.

Duam y Antennas -.01 mt., and 400 ohms.

SIGNAL GENERATOR FREQUENCY ANTENNA SETTING CONNECTION COUPLING

DUMMY ANTENNA

TUNER SETTING

TRIMMER ADJUSTMENT (SEE DIAGRAM

Adjust for Max. 1, 2,

3 and 4

NOTES

No signal will

be heard unless trimmer oondenser under chassis is unscrewed and reduced from original setting

I.F.

455 KC Grid of RF tube 12SK7

GTG

Ground generator

to

chassis

0.01 mfd Out

I.F. 455 EC

Grid of RF

tube 12SK7 GT/G

Ground

generator to

chassis

0.01 mfd Out Trim condenser under chassis for Min.

output.

If it is found that regeneration prevails when the loop antenna is put in its normal position close to

the tubes, then the under chassis trimmer is incor- rectly set, and

should be adjusted to prevent the regenerative condition.


Loop coupling with leads brought

out

400 ohms in series with Antenna & Ond.leads

Out Adjust Oso. #5 for Max. signal


Loop coupling with leads brought

out

400 ohms in series with Antenna & Gnd.leade

Dial set

for 1400KC

Adjust RF trimmer #6 for Max. Signal.


Loop Coupling with leads brought

out

400 ohms in series with Antenna & Ond.leads

Dial set

for 700KC

Adjust RF tuning core #7 for Max. Signal (care should be taken not to disturb carriage position of tuner)

Alternately adjus- R.F. trimmer and R.F. slug until Maximum output is reached at both 1400 KC and 700 KI

as instructed above.

DRIVE CORD REPLACEMENT Turn the tuner to the fully open posi-

tion. Use a new cord 50" long and tie one end to the tension spring. Fasten the other end of the tension spring to the drive pulley. Pass cord through slot in pulley ring; add spring tension and continue one and one-half turns counterclockwise over top of pulley. DRIVE Then pass cord around idler pulley A, PULLEY starting over top and going around clockwise. Pass cord over idler pulley B, starting over top and going around

counter clockwise. Wind one full turn counterclockwise around drive mechanism. Then wind one full turn counterclockwise around driv1 pulley, pass through slot in pulley and tie string to tension spring. Cut off excess string.

Attach dial pointer to cord.

TENSION SPRING

re AO

0

J - DRIVE MECHANISM

©John F. Rider


8 ELECTR. LABS.

MODEL 2811

N

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U

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< a a CD

Á m; e e e: e 1 I I

N

©John F. Rider


EMERSON PAGE 16-1

TYPE: Single -band superheterodyne.

FREQUENCY RANGE: 540-1620 kc.

EXTERNAL GROUND CONNECTION

EXTERNAL CANTENNA CONNECTION

C15

12SA7GT VI

CI 3

R2

EMERSON RADIO &

PHONO. CORP.

I F PEAKED AT 455 K.C.

12SK7GT V2

r T2 -, C77-. GB: -r,.

J

{l C9

MODELS 503,510,510A,520,539 Chassis 120000,120029,120030,

120032,120035,120044

1250iGT V3

CAPACITY COUPLING WOUND IN COIL

RI

T4

C4 R4

R 6

13

R 7

50L6GT V4

C 14

T

>R

G wNEN PART NO

470199SE

IS UD

SW I

cL I n

RIO C16

RII

12 V6

` HEATERS Y /

c) ('s- , e . , I- y LI) o Y 4 N U V) VI V) y, N N A

3575GT

ter, V5

N

T3

R9

Il11

SPI

Schématic Circuit Diagram of Chassis Models 120000, 120029, 120030, 120044 I F PEAKED AT 455 K.G.

Cl


EXTERNA OANTENNAL

CONNECTION

C 15"'"r.

t-O7S WHEN

PART NO. 470199 MUSED

PL1

C

128E6

3

VI 12846 V2

ICC1sI

L

R2

J

R3


R11

...SW I

RI

T 4

CI 4

+

C 16 MAY 8E WIRED 1Cl IE1 IN EITNER ONE OF ' ,WO POSITIONS T SHOWN. I

L

R 12

V6

2 l

IC I7

L

12AT6 V3

'10 . 1./\A, Y j

R4 C9

R 5

o C121.

C II

R6

R

C 13

7 R 8

`SOBS V4

«wo 3) 14

R9

C14 lT3

Ell

`RIO

i5W4 V5

R13 ` 1 III

HEATER.;

co 3 ó m m n tr N N ti

Schematic Circuit Diagram of Chassis Models 120032, 120035

SPI

©John F. Rider


2 EMERSON

!MODELS 503,510,510A,520,539 MODELS 507,509,518,522,535 MODELS 525,552 MODELS 543,544

An oscillator is required.

EMERSON RADIO & PHONO. CORP.

ALL MODELS

with frequencies of 455, 600 and 1425 kc I -f Alignment

An output meter should be connected across the primary or secondary of the output transformer for observing maximum response.

Always use as weak a test signal as possible when aligning the receiver.

Plug the receiver into the power supply outlet in such a way that the ground side of the power line is connected to the receiver B-.

Location of Coils and Trimmer Adjustments

The first i -f transformer is mounted on top of the chassis deck to the right of the variable condenser. The trimmers are accessible through holes in the top of the can.

The second i -f transformer is mounted on top of the chassis between the variable condenser and the speaker. The trimmers are accessible through holes in the top of the can.

The trimmer for the antenna and the trimmer for the oscillator coil are located on the variable condenser. The trimmer on the front section is for the oscillator coil.

1. Rotate the variable condenser to the minimum capacity position.

2. Feed 455 kc to the converter grid (stator of the r -f sec tion of the variable condenser) through a 0.1 mfd. condenser and adjust the four i -f trimmers for maximum response.

R -f Alignment

1. Connect the oscillator to a coil composed of three to four turns of wire wound in a circle approximately 12" in diameter. This coil should be held parallel to and in line with the loop antenna of the receiver at a distance of 15 to 20 inches.

2. Radiate a signal at 1425 kc, set the dial indicator to 1425 kc, and adjust the trimmers on the variable condenser fer maximum response.

3. Radiate a 600 kc signal and tune in the signal on the receiver. Adjust the loose outside turn of the loop antenna for maximum response. This loose turn may be moved to either side of the center. Fasten it in the position which gives maximum response.

The oscillator coil is located underneath the chassis. The 4. loop antenna acts as the antenna coil.

Repeat steps 2 and 3 until no further improvement is

evident. The following voltage readings are d -c measurements taken from B- (line switch) to the indicated tube -socket pin. A 1000 ohms -per -volt meter should be used for all readings except those indicated by an asterisk (*), which should be taken with a d -c vacuum -tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, a.c. Measurements made with 117 volts d.c. wiil be lower than those given below. Take readings with the volume control set at minimum and the variable condenser closed.

PIN NUMBER

TUBE 1 2

- 3 4 5 6 7 8

12SA7 --

89 89 *-10 *-1.6 12SK7 *-1.6 89 89 12SQ7 *-0.7 *-1.6 -0.5 37.5

5oL6GT 110 89 6.2 35Z5GT 116

92

116 117 12BE6 -8.0 92 *-1.3 í2BA6 92 92 1.7 12AT6 *-0-6 *-0.45 *44

SOBS - 5.65 110 92 s

35W4 115 115

* Not supplied separately. CABINET AND DIAL PARTS t Specify part number when ordering.

140015 140016 140034 140007 140070 450060 450080 450050 560110 560220 560120 575047 450000 460140 460470 460150

Cabinet (Model 507 Cabinet (Model 509 Cabinet (Model 518) Cabinet (Model 522 Cabinet (Model 535 Back, molded (Mod Back, molded (Mode Back, molded (Mode Back masonite (Mod Back, masonite (Mo Back, masonite (Mo Back, wood (Model Handle Knob (Models 507, Knob (Model 509) Knob (Model 522)

MODEL --507,509,518,522,535

)

)

el 507)

531009 280003 520499

520024 520350

Dris Dris Dial

5] Dial Dial

Is 509, 518) 5C I 522) 520190 Dial el 507) 5C deis 509, 518) 520440 Dial del 522) 520025 Dial 535) 525080 Dial

52 518, 535) 525130 Dial

411040 Poin

e pulley e shaft backplate (Models 507, 509,

8, 522) backplate (Model 535) crystal, stamped (Models 507,

9, 522), or crystal, stamped (Models 507,

9, 522) crystal (Model 518) crystal (Model 535) pointer (Models 507, 509, 518,

2) pointer (Model 535

ter hub (Model 535)

©John F. Rider


EMERSON PAGE 16-3

MODELS 503,510,510,520,539


CHASSIS 120000, 120029, 120030, 1200.14

Schematic SymbolSymbol ; Part No.DESCRIPTION Schematic tPrt No a . DESCRIPTION

Cl, C2 900170 Two -gang variable condenser L1 700200 Loop antenna, or (chassis 120000) Ll 700210 Loop antenna

Cl, C2 900319 Two -gang variable condenser *PL1 Plug, part of line cord (chassis 120030 and 1200441 RI 310810 22,000 ohms, / watt resistor

Cl, C2 900290 Two -gang variable condenser R2, RS 397000 15 meg., % watt resistor chassis 120029) R3 321330 3.3 meg., / watt resistor

*C3, C4 Trimmers, part of variable condenser R4 390010 0.5 meg. volume control *CS C6,R7 'Trimmers, C7, C8 S

part of i -f transformers R8

321130 340290

470,000 ohms, / watt resistor 150 ohms, /I watt resistor

C9 920170 0.001 mfd., 600 volt condenser R9 370490 1,000 ohms, 1 watt resistor C10 910000 0.00022 mfd. mica condenser R10 321050 220,000 ohms, '/q watt resistor C11 920040 0.1 mfd., 200 volt condenser R11 340050 15 ohms, % watt resistor C12 920010 0.002 mfd., 600 volt condenser R12 340010 10 ohms, % watt resistor C13, C14 920020 0.02 mfd., 400 volt condenser SPI 180000 P.M. speaker C15 920050 0.2 mfd., 200 volt condenser, or *SW1 Line switch on volume control C15 470199 0.2 mfd., 200 volt assembly Ti 720000 First i -f transformer, or

(used only with midget i -f trans- T1 720525 First i -f transformer, midget formers 720525 and 720529) T2 720100 Second i -f transformer, or

C16 920030 0.05 mfd., 400 volt condenser T2 720529 Second i -f transformer, midge C17, C18 925009 50-50 mfd., 150 volt dual electroly- T3 734000 Output transformer

tic condenser T4 716010 Oscillator coil L1 700000 Loop antenna, or 583010 Line cord

CHASSIS 120032, 120035

Cl, C2 *C3, C4

`C5, C6, 1 C7, CS f

900319 Two -gang variable condenser Trimmers, part of variable

condenser Trimmers, part of i -f transformers

R1 R2, R6 R3 R4 R5

310810 397000 340310 321290 390010

22,000 ohms, / watt resistor 15 meg., / watt resistor 180 ohms, % watt resistor 2.2 meg., / watt resistor 0.5 meg. volume control

C9 920040 0.1 mfd, 200 volt condenser R7, R8 321130 470,000 ohms, / watt resistor C10 910000 0.00022 mfd, mica condenser R9 340290 150 ohms, % watt resistor Cll 920010 0.002 mfd., 600 volt condenser R10 370490 1,000 ohms, 1 watt resistor C12 920170 0.001 mfd., 600 volt condenser R11 321050 220,000 ohms, / watt resistor C13, C14 920020 0.02 mfd., 400 volt condenser R12 340050 15 ohms, / watt resistor C15 920050 0.2 mfd., 200 volt condenser, or R13 340010 10 ohms, % watt resistor C15 470199 0.2 mfd., 200 volt assembly (used

only with midget i -f transformers SP1

*SW1 180000 P.M. speaker

Line switch on volume control 720525 and 720529) Ti 720000 First i -f transformer, or

C16 920030 0.05 mfd., 400 volt condenser Ti 720525 First i -f transformer, midget C17, C18 925009 50-50 mfd., 150 volt dual electroly- T2 720100 Second i -f transformer, or

tic condenser T2 720529 Second i -f transformer, midget L1 700000 Loop antenna, or T3 734000 Output transformer L1 700210 Loop antenna T4 716010 Oscillator coil

*PL1 Plug, part cf line cord 583010 Line cord

CABINET AND DIAL PARTS " Not supplied separately. Specify part numbers when ordering

807000 280103 520019

520500

Pilot light Drive shaft Dial backplate, 320° dial numbers

(Chassis 120000 ) Dial backplate, 180° dial num-

520470

460140 460470 460150

Dial crystal, printed (Chassis 120030, 120035)

Knob (Model 503) Knob (Models 510, 539) Knob (Model 520)

beeS (Chassis 120029) 450230 Ivory plastic front, square holes, 412600 Dial backplate, plain (Chassis (Model 520)

120035, 120030) 450230 Ivory plastic front, round holes, 410004 Dial backplate, plain (Chassis (Model 520)

120032, 120044) 450330 Black plastic front, square holes, 520513 Dial face, paper (Chassis 120032, (Model 510)

120044) 450350 Black plastic front, round holes, 525010 Pointer (Chassis 120000, 120029) (Model 510) 525090 Pointer (Chassis 120030, 120032, 140001 Cabinet (Mode! 503)

120035, 120044) 140000 Cabinet (Model 520) 520080 Dial crystal (Chassis 120000, 140005 Cabinet (Model 510, 510A)

120029, 120032, 120044) 140069 Cabinet (Model 539)

The color coding of the i -f transformer leads is as

lows: Grid-green Plate-blue Grid return-black B -r --red

fol- Chassis 120000, 1200029, 120030, 120044 use metal or glass tubes. Chassis 120032 and 120035 use miniature tubes. Model 510A only uses chassis 120035.

t

©John F. Rider


4 EMERSON

MODEL 505 Chassis 120020

EXTERNAL

C7

CHASSIS

ALTERNATE TUBES (ROT ATE RCH4/1SEALEl

IMIER CIRCLES 5005 3554 WISP CERCLES 5011 b 5

POLARIZED PLUG

Y

MCC 23


IRS

L2

ÓÖÖI(ti r - o 1 =C24 C27lll 112L_______J

Ó 119

. 71 ..1-1;- 'B'

BATTERIES 90 VOLTS

I. F. PEAKED AT MIL 1(.C.

V3

>i< 5. TOR vAr ar - EaaTmaa qq

} . `+. ̀_iÌI :

Schematic Circuit Diagram Model

'A' BATTERIES 9 VOLTS

505, Chassis 120020

Chassis 120020 Cl, C2, C3 5

*C4, CS,1 C6 5

C7, C18

900080

920010

Three -gang variable condenser

Trimmers, part of variable condenser 0.002 mfd., 600 volt condenser

R2 *R4

R6, R8

R7

C8, C11 920060 0.05 mfd., 200 volt condenser RIO *C9, C10 Trimmers, part of first i -f transformer R11 *C12 Trimmer and fixed condenser, part

of second i -f transformer R12 R13

C13 910050 0.0004 mfd. mica condenser R14 C14, C21 920020 0.02 mfd., 400 volt condenser RI6 C15. C19 920090 0.01 mfd., 400 volt condenser R17 C16 900110 Padding condenser R18 C17 910010 0.00011 mfd. mica condenser R19 C20, C22, C28 f

920100 0.02 mfd., 200 volt condenser R20 R21

C23 920030 0.05 mfd., 400 volt condenser SPI C24, C25 925050 20-40 mfd., 150 volt dual electrolytic

condenser *SW1 *SW2

C26 925090 100 mfd., 25 volt electrolytic condenser

T1 T2

C27 920110 0.25 mfd., 100 volt condenser T3 L1 700090 Loop antenna T4 L2 737010 Filter choke T5 Rl, R3,1 R5, R9 311330 3.3 meg., / watt resistor R15

310970

321130 311250 321290 390020 321450 310130 310730 340630 340770 340510 394110 310570 310450 180006

713000 720170 720410 734140 716030

TI

U U 0 u O fi 60 V_ 0 4h0

100,000 ohms, / watt resistor 47,000 ohms, / watt resistor

part of second i -f transformer 470,000 ohms, / watt resistor 1.5 meg., / watt resistor 2.2 meg., / watt resisotr 0.5 meg. volume control 10 meg., / watt resistor 33 ohms, / watt resistor 10,000 ohms, '4 watt resistor 3,900 ohms, % watt resistor 15,000 ohms, 1/2 watt resistor 1,200 ohms, % watt resistor 213 ohms, 6 watt resistor 2,200 ohms, / watt resistor 680 ohms, / watt resistor P.M. speaker Line switch on volume control Battery switch on volume control R.F. coil First i -f transformer Second i -f transformer Output transformer Oscillator coil

The cabinet is designed to house the complete set of batteries. The battery complement should be as follows:

Battery Type

Number Required

Eveready Part No.

Rayovac Part No.

Burgess Part No.

4' 2 volt "A" 2 746 (plug-in type)

P83A or EM -83 (plug-in type)

3G (plug-in type)

45 volt "B" 2 482 Minimax (plug-in type)

©John F. Rider


EMERSON PAGE 16-5

EMERSON RADIO &

An oscillator with frequencies of 262, 600 and 1425 kc is required.


Always use as weak a test signal as possible, turning down the output of the test oscillator as the alignment of the receiver progresses.

Plug the receiver into the power supply in such a way that the ground side of the power line is connected to the receiver B-.

Location of Coils and Trimmer Adjustments The oscillator coil (T5) is located beneath the chassis.

The trimmer for the oscillator (C6) is on the middle section of the variable condenser.

The interstage coil (Tl) is the shielded coil located under the chassis. Its trimmer (C5) is on the front section of the variable condenser.

The trimmer for the loop antenna (C4) is on the last section of the variable condenser (the section nearest the loop).

The i -f transformers are mounted on top of the chassis. The first i -f transformer (T2) is mounted next to the loop. The second i -f transformer (T3) is mounted next to the dial

The series padder, C10 for chassis 120002 and C16 for chassis 120020 and 120041, is located on the chassis near the 1T4 tube.

l -f Alignment Rotate the variable condenser to the minimum capacity

position. Feed 262 kc to the converter grid and adjust the three i -f trimmers for maximum response. The signal should be fed through a 0.1 mfd. condenser.

Interstage Alignment 1. Set the dial indicator to 1425 kc, feed 1425 kc to the

r -f grid, and adjust the oscillator and interstage trimmers for maximum response.

2 Set the dial indicator to 600 kc, feed 600 kc to the r -f grid, and adjust the oscillator padding trimmer by rocking in the signal for maximum response.

3 Repeat steps 1 and 2 until no further improvement is possible.

PHONO. CORP.

Loop Alignment Connect the test oscillator to a coil composed of three

or four turns of wire wound in a loop approximately 12" in diameter. This coil should be held parallel to and in line with the receiver's loop at a distance of 15 to 20 inches.

1. Radiate a signal at 1425 kc, tune in the signal on the receiver, and adjust the loop trimmer for maximum re-

sponse.

2. Radiate signal at 600 kc, tune in the signal on the re-

ceiver, and adjust the loose outside turn of the loop antenna for maximum response. This loose turn may be

moved to either side of the center. Fasten it in the

MODELS 505,523 Chassis 120020,120041

position which gives maximum

3. Repeat steps 1 and 2 possible.

Battery Installation

CHASSIS MOUNTING

TWO A' BAT TERIES AND DREW BAT T ERY SHDWN

DTNEAY9' BATTÉRBISET SHOWN N PLACE.

REST LEFT -RAND A' BATTERY ON TWO

BLOGRS PROVIDED

response.

until no further improvement is

INSERT TWO - PRONG PLOCS IN TWO 90 BATTERI[$.

VIEW SHOWING BATTERIES B WIRE CONNECTIONS (w... ea. RaWineI

955006

BACR RETAINING CLAMP

utR LE

OR O C OPERALT A c

REMOVE TM9 PIRG FROM SOCKET AND

NTT

w BATTERY MIST BE INSERTED BEFORE TWO 'A' BATTERIES

CORD

BATTERY RETARING e<DCR.

,;;;i .Acele,: /: ,

GL S flii(14!nI CUT -BRAY VIEW SKWNG BATTERIES RACED N CAM« .

External Antenna For loop antennas that do not have external antenna

connection, wind one turn of insulated wire around or across the loop. Connect one end to an outside aerial. Connect the other end of a good ground or to chassis through a 0.002 mfd. condenser.

The color coding of the i -f transformer leads is as fol-

lows

Grid-green Plate-blue Grid return-black 13+-red

CABINET AND DIAL PARTS

525090 Pointer 520200 Escutcheon (Model 523) 410929 Pointer hub 140002 Cabinet (Model 505) 531009 Drive pulley 140053 Cabinet (Model 523) 280133 Drive shaft 460470 Knob, black 520039 Dial backplate (Model 505) 460140 Knob, brown 520505 Dial backplate (Model 523) 450001 Handle, or 460040 Dial crystal (Model 505) 450280 Handle 520080 Dial crystal (Model 523)

* Not supplied separately. Specify part numbers when ordering. When in doubt of chassis or model also include complete serial number.

©John F. Rider


6 EMERSON

MODELS 505,523 Chassis 120041


TYPE: Three-way (battery, a.c-d.c.) portadle superheterodyne.

FREQUENCY RANGE: 535-1620 kc. .F. PEAKED AT

Ì78

ALTERNATE TUBES

me (NNOTE TER0NANEABLE) C

OOT R Ó ROlen

NOTE ON SOB! OWE, PIN NOB. 7 51 ARE

CONNECTED INTERNALLY.

POLARIZED PLUG

020

eC 21

SC22

K 0 12 IS COMPOSED OF TWO PARTS, A TRIMMER a FIXED CONDENSER. 1\A R8

714

FEMALE RECEPTACLE

R1

7

;L

BATTERIES 9 VOLTS

Schematic Symbol Part No.

Schematic Circuit Diagram Models 505-523,

Chassis 120041 Schematic

DESCRIPTION Symbol

Cl, C2, 1

C3 J 900080 Three -gang variable condenser *R14

*C4, C5, C6 J C8, C14, C20, C21, C22, C28 j

920020

Trimmers, part of variable condenser

0.02 mf d., 400 volt condenser

R6, R8 R10 R11 R12

R7

*C9, C10 Trimmers, part of first i -f transformer R13 C11 920060 0.05 mfd., 200 volt condenser R14

*C12 Trimmer and fixed condenser, part of second i -f transformer

R16 R17

C13 910050 0.0004 mfd. mica condenser R18 C15, C19 920090 0.01 mfd., 400 volt condenser R19 C16 900110 Padding condenser R19 C17 910010 0.00011 mfd. mica condenser R20 C18 920010 0.002 mfd., 600 volt condenser R21 C23 920030 0.05 mf d.; 400 volt condenser SPI

Electrolytic condenser: C24, C25- *SW1 C24, C25,j C26 (

925210 20.40 mfd., 150V.; C26-100 mfd., 25 V.

*SW2 T1

C27 920110 0.25 mfd., 100 volt condenser T2 L1 700233 Loop antenna T2 L2 737067 Filter choke T3 R1, R3,) T3 R5, R9, R15 J

311330 3.3 meg., / watt resistor T4 T5

R2 310970 100,000 ohms, / watt resistor

Model 505 uses chassis 120002, 120020, 120041. Model 523 uses chassis 120041.

IMPORTANT --Where excessive tube burn -out is en-

countered, the 50B5 tube should be replaced only with a

new Emerson tube bearing the designation 274 on the tube base.

SW 2

SPI

NOTE C 24,025 9 0 26 ARE ENCASED IN ONE CAN.

Chassis 120041

t Part No.

321130 311250 321290 390020 321450 310130 310730 340630 340770 340510 394110 394170 310570 310450 180012

713012 720500 720510 720490 720520 734150 716030

DESCRIPTION

47,000 ohms, % watt resistor, part of second i -f transformer

470,000 ohms, / watt resistor 1.5 meg., % watt resistor 2.2 meg., % watt resistor 0.5 meg. volume control 10 meg., T/4 watt resistor 33 ohms., / watt resistor 10,000 ohms, / watt resistor 3,900 ohms, % watt resistor 15,000 ohms, % watt resistor 1,200 ohms, % watt resistor 213 ohms, 6 watt resistor, or 213 ohms, 10 watt resistor 2,200 ohms, / watt resistor 680 ohms, / watt resistor P.M. speaker Line switch on volume control Battery switch on volume control R.F. coil First i -f transformer, or First i -f transformer Second i -f transformer, or Second i -f transformer Output transformer Oscillator coil

POWER CONSUMPTION: 30 watts (line operation).

CURRENT DRAIN:

"A" Battery -0.053 amp.

"B" Battery -0.013 amp.

©John F. Rider


EMERSON PAGE 16-7

EMERSON RADIO & PHONO. CORP. MODEL --505,,523

MODELS 505,523 MODELS 525,552

The following voltage readings are d -c measurements taken with a line voltage of 117 volts, 60 cycles from B- (chassis) to the indicated tube -socket pin. A 1000 ohms -per -volt meter should be used for all readings except those indicated by an asterisk (5), which should be taken with a d -c vacuum -tube voltmeter. The readings with the volume control set at minimum and the variable condenser closed. All voltages are d.c. positive unless indicated otherwise. Voltages for 3Q4 are given for battery operation only. Readings for 50L6 and 35Z5 can be determined from 50B5 and 35W4 by referring to schematic diagram for proper pin connections.

Chassis 120002

TUBE PIN NUMBER

TYPE 1 2 3 4 5 6 7 8 1T4 1.2 88 I 56

I I 1.2 *0.3 12.4

1R5 2.4 I 88

I

56 ( -8 I 2.4 I

*1.5 I

3.7 1T4 3.7

I 98 I 56 I

I 3.7

I

*2.3 14.9 1S5

I I *-0.3 ¡ *19 I *50

I *41.2

I 1.2

3Q4 4.9 i 92 I *1.1 I 98 I

4.9 I 92 I

4.9 117N7

I I 92 I *1.1 ; 98 I 6.25 I 125

Chassis 120020

TUBE TYPE

PIN NUMBER

I 1 2 3 4 5 6 7 1T4 I 1.32 I 90 50

I

1.32 *-0.2 12.55 1RS 12.55 I 90 50 *-7.0 2.55

I 3.85

1T4 I

3.85 98 50 3.8S *1.9 I

5.25 1S5 I

I *-0.35

I *24 *46 *-0.1 ¡ 1.32

3Q4 I 6.1 88 *1.2 I 90 7.6 88 I 9.0 SOBS

I 1.2 6.6 83AC I 33AC 90 98 I *1.2

35W4 I

1.32 I 83AC I 117AC 117AC 108AC I 129

Chassis 120041

TUBE TYPE I

PIN NUMBER

1 2 3 4 5 6 7 1T4 I 1.32

I 90

I 50 1.32 *-0.2

I 2.55

1R5 12.55 I 90 I 50 *-7.0 2.55 ( 3.85

1T4 13.85 I 98 I 50 3.85 *1.9 15.25 1S5

I I I *-0.35 *24.0 46.0 *-0.1 I 132 3Q4

I 6.1 I 88 i *1.2 90 7.6 88 I 9.0

SOBS I 1.2 16.6 I

33AC 83AC 90 98.0 I

1.2

35W4 I I I 83AC 117AC 117AC 108AC I 129

MODEL-- 525,552

VOLTAGE ANALYSIS The following voltage readings are d -c measurements taken from B- (line switch) to the indicated tube -socket pin. A

1000 ohms -per -volt meter should be used for all readings except those indicated by an asterisk (*), which should be taken with a d -c vacuum -tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, a.c. Take readings with the volume control set at minimum and the variable condenser closed.

PIN NUMBER

TUBE 1 2 3 4 5 6 7 8

12SA7 89 89 *-10 *4.6 12SK7 *4.6 89 89 12SQ7 *-0.7 *-1.6 -0.5 37.5

30L6GT 110 89 6.2

35ZSGT 116 116 117


807000 507217

Dial light Dial light socket

520080 520200

Crystal Escutcheon

531059 Drive pulley 140052 Cabinet (Model 525) 280103 Drive shaft 140102 Cabinet (Model 552) 520500 Dial backplate 460470 Knob 525010 Dial pointer 430300 Knob, with indicator dot

t Specify pare numbers when ordering. * Not supplied separately.

POWER CONSUMPTION:

30 watts for the receiver. 20 watts for the phono motor.

The color coding of the i -f transformer leads is as follows:

Grid return -black Plate -blue Grid -green B+ -red

©John F. Rider


8 EMERSON

MODELS 507,509,518,522,535 Chassis 120004,120045


OANTENNA CONNECTION

C 151

«"C I7 WHEN

PART NO. u 470199

IS USED

4-

12BE6 VI


C IA MAY BE WIRED IN EITHER ONE OF TWO POSITIONS SHOWN.

V6


I.F PEAKED AT 455 K.C.

35W4 V5

HEATERS

m N

m N

12AT6 V3

a N



C13

7 R6

R9

C14 T3

R10

Ifc17 g. 1

I C IBI

L

SP I

Schematic Circuit Diagram for Chassis 120004 and 120045

CHASSIS 120004 AND 120045

Cl, C2 900160 *C3, C4 *C5, C6, C7, C8 C9 920040 C10 910000 C11 920010 C12 920240 C13, C14 920020 C15 920050

C15 479199

C16 920030 C17, C18 925009

C17, C18 925000

L1 700000 L1 700200

*PL1

Two -gang variable condenser Trimmers, part of variable condenser

Trimmers, part of i -f transformers 0.1 mfd., 200 volt condenser 0.00022 mfd. mica condenser 0.002 mfd., 600 volt condenser 0.0005 mfd., 600 volt condenser 0.02 mfd., 400 volt condenser 0.2 mfd., 200 volt condenser (Used when T1 and T2 are 720000

and 720100 respectively), or 0.2 mfd., 200 volt condenser (Used when T1 and T2 are 720525

and 720529 respectively) 0.05 mfd., 400 volt condenser 50-50 mfd., 150 volt dual electro-

lytic condenser, or 30-50 mfd., 150 volt dual electro-

lytic condenser Loop antenna, or Loop antenna Power pl , part of line cord

R1 310810 R2, R6 397000 R3 340310 R4 321290 R5 390000 R7, R8 321130 R9 340290 R10 370490 R11 321050 R12 340050 R13 340010 SP1 180000

*SW 1

Ti 720000 T1 720525 T2 720100 T2 720529 T3 734000 T4 716010

807000 507090 583010

22,000 ohms, 4 watt resistor 15 meg., % watt resistor 180 ohms, % watt resistor 2.2 meg., 1/4 watt resistor 0.5 meg. volume control 470,000 ohms, % watt resistor 150 ohms, % watt resistor 1,000 ohms, 1 watt resistor 220,000 ohms, j4 watt resistor 15 ohms, % watt resistor 10 ohms, % watt resistor P.M. speaker Line switch on volume control First i -f transformer, or First i -f transformer, midget Second i -f transformer, or Second i -f transformer, midget Output transformer Oscillator coil Pilot light, Mazda No. 47 Pilot light socket Line cord


Grid-green Grid return-black

Plate-blue B+-red

©John F. Rider For alignment, voltages, and additiona

parts list, see P. 16-2.


EMERSON PAGE 16-9

Ñ Ú

ú

EMERSON RADIO & MODEL 524, Chassis 120011 PHONO. CORP. 524-2, Chassis 120022

rc

N ' óóöpaar i.

i

-rc

J

AAA_-

ce

( L

©John F. Rider


10 EMERSON \\ d dGL'hoemLKicis

MODEL 524 MODEL 524-2 EMERSON RADIO & PHONO. CORP.

+ ó °'

I

m I0

I -- cc _rJ I' _J Ag N eV v/ON V

O

Ô --N^^-II' º N- U U IHI

N

5 I 0 ° It ó' Ii e

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11-11,

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©John F. Rider


áctentaticA EMERSON PAGE 16-11

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F F' N Q f (f) x ZN ?a W a W

óa ö ó`" ó L---1 I1 I- (NedO) o d001 Q

MODEL 524, MODEL 524-2

4

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CJoìsn F. Rider


12 EMERSON

MODEL 524 MODEL 524-2 EMERSON RADIO & PHONO. CORP.

ADJUSTMENTS A signal generator or oscillator is required, containing R -f Alignment

the following radio frequencies, amplitude modulated:

455 kc for intermediate frequencies Band 1-600 kc, 1000 kc, 1500 kc Band 2-1600 kc, 2.5 mc, 4 mc Band 3-4.5 mc, 6 mc, 10 mc Band 4-11 mc, 13 mc, 22 mc

An output meter should be connected across the voice coil of the speaker (3.5 ohms).

Always use as weak a test signal as possible when aligning receiver.

Location of Coils and Trimmer Adjustments

The first i -f transformer is adjacent to the 6SG7 i -f tube, V-4. The trimmers are accessible through the top of the shield can.

1. For Band 1 (540-1620 kc): Set rear antenna and loop switch to antenna position. Apply strong 1500 kc signal through 200 mfd. dummy antenna to antenna binding post in cabinet back. Set pointer to 1500 kc on dial and adjust oscillator trimmer to maximum on output meter. Reduce signal to normal output in the output meter and adjust r -f trimmer and antenna trimmer to maximum on output meter. Set pointer to 600 kc. apply 600 kc signal and adjust iron core to maximum on output meter by "rocking" variable condenser slightly to "track" oscillator with antenna and r -f. With 1500 kc applied, reset pointer at 1500 kc, and readjust only the oscillator trimmer.

The second i -f transformer is adjacent to the 6H6 tube. 2. Bands 2, 3 and 4: Repeat same procedure as on Band The trimmers are accessible through the top of the shield can.

The antenna transformer for all bands is located at the rear of the chassis behind the variable condenser. Trimmers for three bands are located on the top of the transformer for external antenna operation. For loop operation, the trimmers are located on the loop accessible from the back of the cabinet.

The r -f and amplifier transformer is located on the side of the chassis toward the rear. Adjustments for all four bands are located on the top of the shield can.

The oscillator transformer is located at the side of the chassis toward the front. There are two adjustments on this stage for each band. Four iron cores protrude from the top of the shield and four trimmer adjustments are located on the side of the shield.

I -f Alignment 1 Set variable condenser to highest frequency and range

switch to broadcast position. 2. Apply 455 kc to .converter stator terminal in center sec-

tion of variable condenser. 3 Adjust all four trimmers of the two i -f transformers to

maximum on output meter.

1 using following frequencies for alignment:

Band 2

Band 3

Band 4

High frequency 4 mc

10 mc

20 mc

Low frequency 1.7 mc

5 mc

11 mc

3. For loop circuit adjustments operate antenna -loop switch to loop position and adjust trimmers on loop at high- frequnecy alignment points of each band. Use a few turns of wire about six to eight inches in diameter, connected to oscillator and placed approximately 18 inches away from receiver loop as coupling device to radiate a signal into loop. It is not necessary to readjust r -f or oscillator for loop circuit adjustment since they do not change from antenna adjustment indicated above.

4. It should be noted that oscillator frequency on all bands is 455 kc (i -f frequency) above carrier frequency as indicated on dial scale. Stator of each gang of variable condenser is composed of two separate sections. The two sections are connected in parallel on Bands 1 and 2. Bands 3 and 4 use only largest section.

IST TURN HELD IN SLOT DIAL

BY REMAINING 7 SCALE CORD

KNURLED SHAFT

DIAL CORD DRIVES

-o- SE T

SCREW \SLOT

REAR

TUNING COND. CORD

SLOT wry ry

IST TURN HELD IN SLOT BY REMAINING 7

8 TURNS

METAL GROMMET\

©John F. Rider


EMERSON PAGE 16-13

EMERSON RADIO & PHONO. CORP. MODEL 524 MODEL 524-2

REPLACEMENT PARTS LIST

Schematic Symbol

t Part No. DESCRIPTION Schematic Symbol

tPart No. DESCRIPTION

Cl *C2, C3, j

C4 'ß`C5, C6, j

C7 J

03, C16 C9, C19, C35, C43, C46, C48 ClOa, b, j c, d, e, f J

Cii, C18, C34 j

*C12, C13,j C14, C15 J

C17

C20

C21 C22,C42,1 C44,C49 j C23 C24 C25 C26

*C27,C28, j C29,C30 j C31, C37

*C32, C33

C36 *C38, C39

*C40, C41

C45 C47 C50

C51

I1, I2

910180

920060

920210

900200

920040

915040

925030

910170

910100 915030 915020 915010 915000

920270

920090

920230 920240 925010

925220

807020

0.001 mid., 500 volt mica condenser

Trimmers, part of hoop assembly

Trimmers, part of antenna coil

0.05 mfd., 200 volt condenser


Three -gang variable condenser


Trimmers, part of r -f coil

0.68 mmfd., 500 volt ceramic condenser

16 mfd., 300 volt electrolytic condenser

0.003 mfd., 500 volt mica condenser 0.0001 mid., 500 volt mica con-

denser 0.00056 mfd. silver mica condenser 0.0015 mfd. silver mica condenser 0.003 mfd. silver mica condenser 0.0068 mid. silver mica condenser Trimmers, part of oscillator coil

0.05 mfd., 600 volt condenser Trimmers, part of first i -f trans-

former 0.01 mfd., 400 volt condenser Trimmers, part. of second i -f trans-

former 50 mmfd. condenser, part of second

i -f transformer 0.005 mfd., 600 volt condenser 0.0005 mrd., 600 volt condenser 40 mfd., 400 volt electrolytic con-

denser 40 mfd., 400 volt electrolytic con-

denser Pilot light, Mazda No. 44

LI L2 L3 L4 L5 L6 L7 P1 Q1

R2, RS R25 ,

j J

R3, R15 R4, R13 R6 R7 R8, R9 R10 R11 R12, R31 R14 R16

*R17

*R18

R19 R20 R21 R21 R22 R23, R24 R26, R27 R28

R29 R30 Si S2

*53 T1 T2 T2

700110 710020 713010 716110 720330 720340 737030 583180 180024 310430

321050

370910 320290 397080 310350 340650 310810 320730 320650 321210 310650

310830 390070 390360 390080 321450 351050 311050 394140

320410 310070 510280 510290

734160 730000 730010

Loop assembly Antenna coil R -F coil Oscillator coil First i -f transformer Second i -f transformer Filter choke Line cord and plug P.M. speaker 560 ohms, ¡q watt resistor

0.22 meg., % watt resistor

56,000 ohms, 1 watt resistor 150 ohms, j4 watt resistor 22,000 ohms, 2 watt resistor 270 ohms, j watt resistor 4,700 ohms, %a watt resistor 22,000 ohms, % watt resistor 10,000 ohms, j4 watt resistor 4,700 ohms, Xi watt resistor 1 meg., % watt resistor 4,700 ohms, % watt resistor 4,700 ohms, yq watt resistor, part of

second i -f transformer 1 meg., % watt resistor, part of

tuning indicator socket cable 27,000 ohms, '/4 watt resistor

, 0.5 meg., watt volume control 0.5 meg., Ve watt volume control, or 0.5 meg., % watt volume control 10 meg., '/4 watt resistor 0.22 ohms, % watt resistor 0.22 ohms, '/4 watt resistor 180 ohms, 2 watt wire -wound

resistor 470 ohms, 34 watt resistor 18 ohms, 3a watt resistor 7 -wafer, 5 -position band switch 3 -pole double throw antenna switch Line switch, part of volume control R20 Output transformer Power transformer (Chassis 120011) Power transformer (Chassis 120022)


140004 620030 620012 587040 525110 280023 280033

Cabinet Knob Knob, with indicator dot Drive cord spring Pointer Drive shaft Clutch shaft

280043 411361 520006 470035 470032 507219

Drive shaft pulley Dial bracket Dial glass Dial bracket assembly (left) Dial bracket assembly (right) Dial light assembly

:5 Not supplied separately. Specify part numbers when ordering. When in doubt of chassis or model also include complete serial number.

VOLTAGE ANALYSIS The following voltage readings are d -c measurements taken from B- (line switch) to the indicated tube -socket pin. A

1000 ohms -per -volt meter should be used for all readings. Readings indicated by an asterisk (*) are a.c. Line voltage is 117.5 volts, 60 cycles a.c. Set volume control at minimum and variable condenser to 1000 kc.

PIN NUMBER

TUBE 1 2 3 4 5 6 7 8

6SG7(V1) L6 1.6 130 *6.3 280

6SA7 275 90 -0.02 2.4 *6.3

6J5 215 -0.02 *6.3

6SG7(V4) 1.5 1.5 120 *6.3 280

6H6 -0.04 *6.3

6SL7 70 -0.04 60 *6.3

6V6(V8,V4) 285 280 *6.3 17

5U4G 290 *285 *285 290

Ne oltage readings for 6U5/6G5 measured at lead terminals are as follows: black -0; green- --0.04; red -280; brown -0; black -6.3.

1r

@John F. Rider


14 EMERSON

MODELS 525,552 EMERSON RADIO & PHONOGRAPH CORP. Chassis 120037

12SA7GT VI

r

iC

C13

L


EXTERNAL ANTENNA CONNECTION


IF PEAKED AT 455 K C TYPE: Single -band superheterodyne and automatic

record changer.

2

C 15

Cl

C11 R6

SW 1

REAR OF WAFERRoNTI VE WED FROM F r-

J R5 ( R4

3

R II

P1-4 PL

SW 4

o -

C16

CIlB

SW 3

PL Ir

MI

/.

SW 2

C 17

REAR OF WAFER VIEWED FROM REAR IN RADIO POSITION

R12

PL 2

e

V

PL S

Schematic Symbol t Part No.

Cl, C2 900290 *C3, C4 *C5, C6, C7, C8

C9 910000 C10 920010 C11 920515 C12 920240 C13, C14 920020 C15 920040 C16 920050

C17, C19 920030 C18 922090

C18 922101

C20, C21 925267

C20, C21 925110

L1 700000 L1 700200 L1 700210 Ml 819019 PL1 505040

o

DESCRIPTION

Two -gang variable condenser Trimmers, part of variable condenser

Trimmers, part of i -f transformers

0.00022 mfd. mica condenser 0.002 mfd., 600 volt condenser 0.002 mfd., 400 volt condenser 0.0005 mfd., 600 volt condenser 0.02 mfd., 400 volt condenser 0.1 mfd., 200 volt condenser 0.2 mfd., 200 volt condenser (used

only when Tl and T2 are 720000 and 720100 respectively)

0.05 mfd., 400 volt condenser 0.05 mfd., 400 volt condenser

(used up to serial No. 8,550,551), or

0.05 mfd., 400 volt condenser (used after serial No. 8,550,551)

30-50 mfd., 150 volt dual electrolytic condenser (used up to serial No. 8,550,551), or

30-50 mfd., 150 volt dual electrolytic condenser (used after serial No. 8,550,551)

Loop antenna, or Loop antenna, or Loop antenna Automatic record changer Connector plug

CF!

5045

IF SORS IS uSED AS AN ALTERNATE FOR SOL6GT PINCONN- ECTIONS AM AS sHOWN A.OVE

20

HEATERS

o Io

5,

Schematic Symbol t Part No.

PL2 *PL3

PL4 *PL5

R1 R2, R4 ,R3

R5 R6, R7 R8 R9 R10 R11 R12 R13 R14 SPI SW1 SW2

*SW3

*SW4 T1 T1 T2 T2 T3 T4

508010

585070

310810 397000 321330 390010 321130 340290 321290 370490 321050 321210 340010 340050 180000 510130 510390

720000 720525 720100 720529 734200 716010

ó

L_

DESCRIPTION

SP I

Pickup socket Polarized male plug, part of record

changer Female plug and cable Power plug, part of line cord 22,000 ohms, % watt resistor 15 meg., % watt resistor 3.3 meg., % watt resistor 0.5 meg. volume control 470,000 ohms, % watt resistor 150 ohms, % watt resistor 2.2 meg., % watt resistor 1,000 ohms, 1 watt resistor 220,000 ohms, % watt resistor 1 meg., / watt resistor 10 ohms, % watt resistor 15 ohms, % watt resistor P.M. speaker Tone control switch Phono -radio switch Motor switch, part of record

changer Line switch on volume control First i -f transformer, or First i -f transformer Second i -f transformer, or Second i -f transformer Output transformer Oscillator coil

©John F. Rider For alignment, see P.16-2 For voltage analysis and cabinet parts, see P.16.7


EMERSON PAGE 16-15

ANTENNA

Schematic Symbol

Cl, C2

*C3, C4

C5, C15

*C6

C7, C12

C8, C9,

C10

*C11

C13, C16,

C19, C20

C14

C17

C18

C21

C22

PL1

PLI

Rl, R4

174

t Part No.

900070

920170

910000

920100

910250

910010

920515

920040

925003

585311

585312

310730

R2

MODELS 531,532,633 EMERSON RADIO & PHONO. CORP. Chassis 120040

C4+ A a

C 21

5

r

R4

MC 20

`1Y

DESCRIPTION

CUIS COMPOSED OF TWO 1. F. PE AT 4 5 KC. PARTS, A TRIMMER AND

A FIXED CONDENSER.

Schematic Symbol

Two -gang variable condenser R2

Trimmers, part of variable condenser


Trimmer, part of antenna transformer R6

0.00022 mf d. mica condenser R7

Trimmers, part of i -f transformer R8, R11

R9

Trimmer and fixed condenser, part of second i -f transformer


0.00005 mf d. mica condenser

0.00011 mfd. mica condenser



16 mfd., 150 volt electrolytic condenser

Battery plug and cable assembly, or

Battery plug and cable assembly

10,000 ohms, / watt resistor

* Not supplied separately.

t Specify part numbers when ordering.

R3

*R5

R10

R12

R13

SPI

SW1

SW1

T1

T2

T3

T4

T5

MC 22

`111F

VIEW Lomas V-

AT CABLE SIDE OF PLUS.

tPart No.

321130

320970

390180

321450

321330

321210

390280

310770

310410

180008

510401

510001

710001

720530

720531

734203

716001

G13 304

RIO

5 t

s

R IS

DESCRIPTION

470,000 ohms, j4 watt resistor


47,000 ohms, / watt resistor, part of second i -f transformer

0.5 meg. volume control

10 meg., / watt resistor

3.3 meg., / watt resistor

1 meg., / watt resistor

0.4 meg. tone control


470 ohms, / watt resistor

P.M. speaker

Battery switch, or

Battery switch

Antenna transformer and trap

First i -f transformer

Second i -f transformer

Output transformer

Oscillator coil

Battery replacement - Replace battery pack with one

of the following types: Eveready No. 748 or No. 758,

Rayovac No. AB82, Burgess No. 17GD60, General No. 60D1OL, or Bright Star No. 6105.

©John F. Rider


16 EMERSON

MODELS 531,532,533 EMERSON RADIO & PHONOGRAPH CORP.

The following voltage readings are d -c measurements from tube socket pin to chassis. A 1000 ohms -per -volt meter should be used for all readings except those indicated by an asterisk (*), which should be taken with a d -c vacuum -tube voltmeter. All voltages are positive unless otherwise indicated.

PIN NUMBER TUBE 1 2 3 4 5 6 7

1T4(V1) 55 52 82 *-.3 1.5

1R5 82 57 *-11.0 *-.4 1.5

1T4(V3) 82 52 *-.4 1.5

1S5 -6.2 *-.45 *18 10 *-.3 1.5

3Q4 80.0 *-6.2 82 1.5 80

An oscillator with frequencies of 455, 600, and 1425 kc is required.

An output meter should be connected across the primary or secondary of the output transformer' for observinc,, maximum response.

Always use as weak a test signal as possible, turni,. down the output of the test oscillator as the alignment of the receiver progresses.

I -f and Trap Alignment

1. Rotate the variable condenser to the minimum capacity position.

2. Feed 455 kc to the grid (pin 6) of the 1R5 tube through a 0.1 mfd. condenser.

3. Adjust the four i -f trimmer screws (C8, C9, C10, C11) for maximum response. Feed 455 kc to the antenna through a standard dummy antenna (a 0.002 mfd. condenser may be used as a substitute) and adjust the wave - trap trimmer for minimum response.



Plate-blue B+-red


L

560190

280313

Rear cover (Model 533)

Drive shaft

520360 Dial backplate

520450 Dial Glass

525012 Dial pointer

140062 Cabinet (Model 531)



460140 Knob (Model 531)

460470 Knob (Model 532, 533)

560200 Rear cover (Model 532)

LARGE IDLER PULLEY

Location of Coils and Trimmer Adjustments The oscillator coil (T5) is located beneath the chassis.

The trimmer for the oscillator (C4) is on the front section of the variable condenser.

The trimmer for the antenna (C3) is on tion of the variable condenser.

The i -f transformers are mounted on top of the chassis. The first i -f transformer (T2) is mounted in back of the speaker. The second i -f transformer (T3) is mounted next to the output transformer.

The 455 kc wave -trap is part of the antenna coil assembly, which is located on the underside of the chassis.

R -f Alignment

tua rear sec,

Feed 1620 kc through a standard broadcast dummy antenna to the antenna lead (A 0.0002 mfd. condenser may be used as a substitute). Adjust oscillator trimmer (C4). Move pointer to 1425 kc and feed 1425 kc signal. Adjust antenna irimmor (3C) for maximum response.

POINTER

CUT -AWAY VIEW SHOWING METHOD OF STRINGING PULLEYS.

REAR IDLER PULLEY

CONDENSER PULLEY

DRIVE SHAFT

SMALL IDLER PULLEYS

FRONT IDLER PULLEY

©John F. Rider


EMERSON PAGE 16-17

LI


°AXTERNA NTENNAL

CONNECTION

C IS

zc IS WHEY

PARI NO ad 470199

2 IS USED

CI

EMERSON RADIO & PHONOGRAPH CORP.

128E6

C13

VI


'X'

R

RI

i 4

e

ED C 16¿ C 16 MAY BE WIR IN EITHER ONE OF .N TWO POSITIONS SHOWN.

R2

CI 4

I.F PEAKED AT 455 K.C.

12BÁ6 V2

R3

C9 R4

R 5

C 10

C II

---Il R6

R

C 13

7 R 8

R


SP I

Schematic Circuit Diagram Chassis 120046

CHASSIS 120046

CI, C2 *C3, C4 á'C5, C6, 1

C7, C8 J

C9 C10 C11 C12 C13, C14 C15

C15

C16 C17, C18

L1 *PL I

R1

900013

920040 910000 920010 920240 920020 920050

470199

920030 925009

700000

310810

Two -gang variable condenser Trimmers, part of variable condenser Trimmers, part of i -f transformers 0.1 mfd., 200 volt condenser 0.00022 mfd. mica condenser 0.002 mfd., 600 volt condenser 0.0005 mfd., 600 volt condenser 0.02 mfd., 400 volt condenser 0.2 mfd., 200 volt condenser (used

when TI and T2 are 720000, and 720100 respectively), or

0.2 mfd., 200 volt assembly (used when T1 and T2 are 720525 and 720529 respectively)

0.05 mfd., 400 volt condenser 50-50 mfd., 150 volt dual electrolytic

condenser Loop antenna Power plug, part of line cord 22,000 ohms, ?tea watt resistor

R2, R6 R3 R4 R5 R7, R8 R9 R10 R11 R12 R13 SPI

*SW1 T1 T1 T2 T2 T3 T4

397000 340310 321290 390015 321130 340290 370490 321050 340050 340010 180000

720000 720525 720100 720529 734000 716010 583010 807000 507090

15 meg., 'A watt resistor 180 ohms, % watt desisteor 2.2 meg., / watt resistor 0.5 meg. volume control 470,000 ohms, / watt resistor 150 ohms, % watt resistor 1,000 ohms, 1 watt resistor 220,000 ohms, / watt resistor 15 ohms, % watt resistor 10 ohms, % watt resistor P.M. speaker Line switch on volume control First i -f transformer, or First i -f transformer, midget Second i -f transformer, or Second i -f transformer, midget Output transformer Oscillator coil Pilot light Line cord Pilot light socket


280024 Drive shaft 140082B Cabinet, black 520033 Dial face 410090 Metal grille 525015 Dial pointer 520034 Dial crystal

140080B Cabinet, ivory 460470 Knob

©John F. Rider For alignment and voltage, see P. 16-2


18 EMERSON

MODELS 543,544 Chassis 120052 EMERSON RADIO & PHONOGRAPH CORP.



IF. PEAKED AT 455 K.C.

¡11 C9

EXTERNAL 0 ANTENNA CONNECTION


C2

AC OR DC -- L INE SW

PILOT LIGHT

C

12 T3

R7

SPI

Schematic Circuit Diagram Chassis 120052

CHASSIS 120052

Schematic Symbol

tPart No. DESCRIPTION Schematic

Symbol t Part No. DESCRIPTION

Cl, C2 900160 Two -gang variable condenser R3 390015 0.5 meg. volume control *C3, C4 Trimmer, part of variable condenser R4, R5 321130 470,000 ohms, % watt resistor *C5, C6, j C7, C8 f Trimmers, part of i -f transformers R6 ormers

R7 340290 370490

150 ohms, 1/2 watt resistor 1000 ohms, 1 watt resistor

C9, C15 920010 0.002 mfd., 600 volt condenser R8 310810 22,000 ohms, '/4 watt resistor C10 920240 0.0005 mfd., 600 volt condenser R10 340010 10 ohms, % watt resistor C11, C12 920020 0.02 tnfd., 400 volt condenser R11 397040 15 ohms, 1 watt wire -wound resistor C13 910000 0.00022 mfd. mica condenser R12 321050 220,000 ohms, % watt resistor C14 920040 0.1 mfd., 200 volt condenser SP1 180000 F.M. speaker C16 920030 0.05 mfd., 400 volt condenser *SW1 Line switch on volume control C17, C18 925000 30-50 mfd., 150 volt dual electrolytic T1 720000 First i -f transformer condenser T2 720100 Second i -f transformer C19 920050 0.02 mfd., 200 volt condenser T3 734000 Output transformer

L I 700000 Loop antenna, or T4 716010 Oscillator coil L1 700200 Loop antenna 583010 Line cord RI, R9 397000 15 meg., % watt resistor 807000 Pilot light R2 321330 3.3 meg., '/4 watt resistor 507090 Pilot light socket

t Specify part numbers when ordering. * Not supplied separately.



Plate-blue B+-red

©John F. Rider For alignment and voltage, see P.16-2


EMERSON PAGE 16-19

EMERSON RADIO & PHONOGRAPH CORP.

TYPE: Single -band superheterodyne with hearing aid receiver.

FREQUENCY RANGE: 540-1620 kc. F PEAKED AT 455 K.C.

MC 25

EXTERNAL ANTENIA CONNECTDN

ACORDC LINE

Schematic Symbol

C 8 IS COMPOSED CF TWD PORTS A TRIMER a A FIXEDCONDENSER

R9

C 16

TV- CHASSIS

RIO

Part No.

Cl, C2 *C3, C4 *C5, C6, 1

C7, C8 J C9, C15, 1

C20, C25 j

C10 C11, C12,1 C21 f C13 C14 C16 C17, C24 C18, C19

C22 C23

L1 R1 R2, R9 R3, R4 R5 R6 R7, R14 R8 R10 R11 R12

900070

920010

920240

920020

920040 910010 920050 920030 925011

920060 925180

700000 340810 397000 351130 340290 370490 351330 390190 351050 340010 340050


DESCRIPTION Schematic Symbol

L8_eºJ

Part No.

Two -gang variable condenser R13 Trimmers, part of variable condenser

Trimmers, part of i -f transformers



0.02 mf d., 40C volt condenser

0.1 mfd., 200 volt condenser SPI 0.00011 mfd. mica condenser SP2 0.2 mfd., 200 volt condenser SP2 0.05 mf d., 40C volt condenser 50-50 mf d., 150 volt dual electrolyti SWI

*SW2 Ti T2 T3

R13

condenser 0.05 mfd., 200 volt condenser 10 mfd., 25 soit electrolytic

condenser Loop antenna 22,000 ohms, / watt resistor T4 15 meg., / watt resistor 470,000 ohms, / watt resistor T4 150 ohms, / watt resistor 1000 ohms, 1 watt resistor T5 3.3 meg., 3/2 watt resistor 0.5 meg. volume control 220,000 ohms, % watt resistor 10 ohms, / watt resistor 15 ohms, / watt resistor

R15 R16

R16

390180

390014

340410 351050

340970

180008 829001 829002

510120

720380 720390 734080

716070

716005

734001

807000 507215 583150

C 21

T5

W J V

W la J u <ú W W ¢

o

o 4

SP 2

CRYSTAL, I ..I m14 ; IPL MAGNET

NOTE. If CRYSTAL EAR RECEIVER Is USE°. CONNECT TO RNs NOS I ASO 3.

DESCRIPTION

0.5 meg. volume control (sets below 8,767,450), or

2 meg. volume control (sets 8,767,450 and higher)

470 ohms, 'A watt resistor 220,000 ohms, / watt resistor

(sets below 8,767,450), or 100,000 ohms, % watt resistor

(sets 8,767,450 and higher) P.M. speaker Telex ear receiver (name imprinted), or American Earphone ear receiver (no

imprint) Tone control switch Line switch on volume control First i -f transformer Second i -f transformer Output transformer

speaker) Oscillator coil (sets

8,767,450), or Oscillator coil (sets

higher) Output transformer

receiver) Pilot light Pilot light socket Line cord

(used with

below

8,767,450 and

(used with ear

©John. F. Rider


20 EMERSON

MODELS 1002,1003 EMERSON RADIO & PHONOGRAPH CORP.

An oscillator with frequencies of 455, 600 and 1425 kc is required.


Always use as weak a test signal as possible when aligning the receiver.

Plug the receiver into the power supply outlet in such a way that the ground side of the power line is connected to the receiver 13- R -f Alignment

1. Connect the oscillator to a coil composed of three or four turns of wire wound in a circle approximately 12" in diameter. This coil should be held parallel to and in line with the loop antenna of the receiver at a distance of 15 to 20 inches.

2. Radiate a signal at 1425 kc, set the dial indicator to 1425 kc, and adjust the trimmers on the variable condenser (C3. C4) for maximum response. Radiate a 600 kc signal and tune in the signal on the receiver. Adjust the loose outside turn of the loop antenna for maximum response. This loose turn may be moved to either side of the center. pasten it in the position which gives maximum response.

4. Repeat steps 2 and 3 until no further improvement is evident.

Location of Coils and Trimmer Adjustments The first i -f transformer (T1) is mounted on top of the

chassis deck at the rear and to the right of the variable condenser. The trimmers (g5, C6) are accessible through holes in the top of the can.

The second i -f transformer (T2) is mounted on top of the chassis to the right of the speaker. The trimmers (C7. C8) are accessible through holes in the top of the can.

The trimmer for the antenna (C3) and the trimmer for the oscillator coil (C4) are located on the variable condenser. The trimmer on the front section -is for the oscillator coil.

The oscillator coil (T4) is located underneath the chassis. The loop antenna acts as the antenna coil.

l -f Alignment 1. Rotate the variable condenser to the minimum capacity

position.

2. Feed 455 kc to the converter grid (stator of the r -f section of the variable condenser) and adjust the four i -f trimmers (C5, C6, C7, C8) for maximum response.


Grid-green Plate-blue Grid return-black BL-red

The following voltage readings are d -c measurements taken from B- (line switch) to the indicated tube -socket pin. A 1000 ohms -per -volt meter should be used for all readings except those indicated by an asterisk (*), which should be taken with a d -c vacuum -tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, a.c. Measurements made with 117 volts dr. will be lower than those given below. Take readings with the volume control set at minimum and the variable condenser closed.

TUBE 1 2 3 4

89

WV 5 6 7 8 12SA7 89 *40

89

*-1.6 6SS7 (V 2) *-1.6 89

12SQ7 `4).7 *4.6 *-0.5 *52.0 50L6GT

35Z5GT 110 89 6.2

116

*40.0

117 6SS7(V6) 1.4 1.4 89

CABINET, DIAL AND ACCESSORY PARTS

520480 280313 520450 525012 140029 560101 460470 140054 460140 470222

585315

585122

508115 460005 460006 505057 505058 204116 470220 829003

Dial backplate Drive shaft Dial glass Pointer Cabinet (Model 1002) Cabinet back (Model 1002) Knob (Model 1002) Cabinet (Model 1003) Knob (Model 1003) Plug and cable with ear receiver,

complete

Plug and cable (for ear receiver 829001)

Plug rid cable (for ear receiver 829002)

Socket for ear receiver plug Ear mold, or Ear mold Plug, less cover and screw Plug cover Machine screw Under -pillow speaker, with plug Under -pillow speaker, less plug

LARGE IDLER PULLEY

POINTER

CUT -AWAY VIEW SHOWING METHOD OF STRINGING PULLEYS.

CONDENSER PULLEY

DRIVE SHAFT

SMALL IDLER PULLEYS

FRONT IDLER PULLEY

©John F. Rider


EMOR PAGE 16-1

6c

Sw

(1 5A7

Bc

EMOR RADIO, LTD. MODEL 100

GS KT

1A ON V. C .

.45--48"4"

TO CHANGE TUBES - REMOVE 8 TOP DIAL SCREWS AND LIFT OFF TOP BOWL

TO SERVICE CHASSIS -

REMOVE 3 CAP NUTS AFTER REtMOVING SCREWS

SAS IN TUBE CHANGE

TONING COLLAR

-RAVE CHANGE COLLAR VOLUME CONTROL COLLAR

UT THESE THROUGH

ANTENNA PIPE AND FOWER CORD BASE AFTER

BASE IS `ATTACHED

TO ATTACH BASE PUT ONE

LOCKWASHER ON EACH SCREW - PASS THROUGH HOLE IN BASE AND THREAD

INTO RING ON END OF PIPE

RING WITH 3 THREADED HOLES

BASE

LOCKWASHER

et , SCREW

6v6 OCTOBER 194e

A . CPT, o,vn ti

eCuii

124,2"S,2f TTT SPEAKER GRID Reception is evenly distributed.

TUNING Tuning control in top sleeve over tubular stand revolves entire globe that has oversize dial. Indi- cator illuminates on station location.

WAVE CHANGE CONTROL Long and Short Wave.

VOLUME CONTROL Designed for smooth, easy regu- lation.

ADJUSTABLE HEIGHT Height can be adjusted from 31/2' feet to 5 feet.

FLOOR MODEL

©John F. Rider


schematics rr PAGE 16-2 EMOR

MODEL 100 EMOR RADIO, LTD.

Lim) nrcrom

o

}rs0000

o rnm

buibuJ

'-f-

t',

IF ----I1' ó

0 p

}r1/S0000-

o

+ m

+ m

©John B. Rider


ESPEY PAGE 16-1 ESPEY MFG. CO. INC. CHASSIS FJ-97A.Revise

h a r

N

á 4

á á

n

a m

ú =$

* YIl 4)

U N 7G N "rN^^._

OY $ ^N ^^^^^ mY

K $ O C Y

Y Yg r----

N 7

a

N

gil

©John F. Rider

ú

m

I

n I

I I

11 1 1

11

eia

y0010J ~ f 1u1'e4- /!"2[15?j5-1 ; III)

N

ee ;_ gT

7; /

6 Ñ /

O

v

O

m

od á á 191g1g

RECORD CHANGER: Seeburg Model K, P.15 -e


N%

PAGE 16-2 ESPEY scheinalics If

HASSIS FJ-97A,Revised

1-1

N

N

v

aiu

(r)

ESPEY MFG. CO. INC.

zº z x N Oa 00]c7v

N 3 Z' CL á ïáD0 Z

per in

(3iºC3.9co`c

V Q

o 00e

CsJ

a áac

cr)

®W 1-.

U

N N J

w z

(Ni LLl v M . N U

g,

N

©John F. Rider


ESPEY PAGE 16-3

ESPEY MFG. CO. INC. MODEL 5181

J

n ó Z

.

a Tai h

l + N

N

1

J $ J

f

e

h o'1 i ae v 1

o N

e-

1, iHl,. é

t , T

717 Q9 º J (-0.72f

fifirn -tri - DI 4.

J

1r. 1 -t HI' *-1E--4 \4ºQ '--i 9-1

114

V

1)40Gr1.1J I 1 t

_ o

L4 o

114 T

o r

E --

LLJ

©John F. Rider


?AGE 16-4 ESPEY

lahiped dd'.Keiltuatics n

MODSI, 5181 ESPEY MFG. CO. INC.

51(

I

6K7 R.F.

.1 MEG.

GANGED

AVC

BAND-SWITCH SHOWN AT 1ST POSITION.

BAND 1

140-380 KC.

6K7 R.F.

- B+

.l MEG.

GANGED

AVC

BAND -SWITCH SHOWN AT 2ND POSITION. BROADCAST BAND

550 - 1800 KC.

.2sflf

300n

B+ AVC

- Sojuf \

.005juf

eoo1i uf

617 ST DET.

\ /

50Kn

-

617 1ST DET.

5 Kn

41 O SC.

4Kn

et

5 K1L

B+

©John F. Rider


dCilBmat[!dn ESPEY PAGE 16-5

ESPEY MFG. CO. INC. MODEL 5181

VVV + - 30011

GANGED

AVC

BAND -SWITCH SHOWN AT 3RD POSITION

BAND 3 1.8 - 5.0 MC.

6K7 R.F.

3

B+ = 30011

GANGED

AVC

BAND -SWITCH SHOWN AT 4T" POSITION

BAND 4 5.0- 14 MC.

6K7 R.F.

8+ 300A -

GANGED

1709uNf

5K I .1

AVC

6 L7 1sT DET.

Mo5juf

6 L7 1sT DET.

16 5 50K11

ISKn

B+

41 05C.

16 50Kn

©John F. Rider


6 ESPEY MODEL 5181 ESPEY MFG. CO. INC.

rISTRIB'1TTLV 0+ *VC VOL^AO

PATH OP A.V.C. AND SIGNAL VOLTAGE

u

,tose

CSoc{e

Sharp AVC

Broad 0V'

Breed Are voltage for Sr A let het In Rende 102

Sigh fidelity' audio signal

standard Audio aigncl and all other AVO voltags.

Pe.w«SiriA

-4>

® 6P v " 6c 6G. Ltsl

O e (f°6

o O 1

0

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3' I.F.

Tuning unit on or trimmere and ddgrs

çJ Sor!

50f)e

14[®(

e

(77KelA ¡ aa*Re

4

B...H FIPEL.TY Oar Jv

014 -OFF 5...: «.

M E 12í11c öooKc

SENStTaVtry CeN TRe l.

4 PHoa;eStotTcN

321,L l 14

12fgc t400A

zinc' 64c lea ó006-c

Mineral. lndicnte rr.luenclee st whtoh the werlo..a trtmmere and paddere are yap ,ted.

Altgrunent .ttn Output Meter

1. Jhort either Bile of the broadcast R. F. coil trouser to ground.

desove the first detector t6L7) Crin cap und apply a 456 K. C. mod-

ulated eigmal. The fidelity s..itch u.uet be in the eK ary los ltton

(left). Renoue the oscillator tube (41). Align the trine:ern of the

tnird, second ana first 1. F. transformers for uta01:.Us, output in tue

order glve0.

2. Amplafled A. V. C. ana Band e adjustment:

Put the cap buck on the 6..7. Place toc 41 an its noc:.et. Set

oral at 14U0 h. C. teed 1400 A. C. eagdul trot the generator to tue

'set. Aujuat oscillator, h. F. and' antenna trluauern for 1..1.eum el..l.1.

Remove tue short fru» the Broadcast h. F. coil trimmer berne careful out

.to alter tue netting of ettoer the set or generator. Set Loto A.

I. F. trt.a.ers for minimum output. Now turn dial tu irla K. C. un. teed

a 600 K. C. signal from generator und aijuet padder while rucei ne vuria..le

slightly sack and forth for beat adjustment. Repeat 14Úu adjus twat.

ADJUSTMIJT OF OTP.rtl BAMLS

sand 1

Oscillator, R. F., and antenna trimmers are adjusted at 300 0. t

The padder lu adjusted at 150 :e. C. Repeat 300 K. C. adjustment.

Cana 3

0eo111ator, ii. 1., ani antenna trlmwfre are aojus ted at 4 M. L.

ne gadder is adjusted at z K. C. Repeat 4 E. C. adjustment.

"Ube BAND Li?

4 RF r rK KGENERATeA1 ÏoNECo1rRo ti

N4:NçpelTí JW rTe H

Socket Voltage heedinge

VeltM! Cou T Rol- epJ-OfF 5,u tTCN

Jo Signal Maximum Sensitivity Meter 1000 oases per volt

Tubes Heater Volte S. G. Cathode Plate Cathode Current La.

6K7 h. F. 6.3 76 1.7 230 6

617 let Jet. 6.3 76 2.2 220 4

41 bec. 6.3 0 160 17

6E7 let i. F. 6.3 90 2.4 230 8

617 end I. a. 6.3 90 2 210 7

617 A.V.C. 6.3 90 4.2 230 7

6F5 let Audio 6.3 .8 70 e

6C5 Phaee inverter 0.3 2.1 65 1

&C6 end Audio 6.3 6.6 230 6

6F6 3rd Audio 6.3 sise 38 V 0 340 2e

513 Rectil ter 5 330 clap 140

400-400 6a5 Tuning gee 6.3 0 90 3

Voltage Hatt...A 105-125 Volt. A. C. 50-60 Cycles

Mower Con...u.ption: 160 Matte

Type and .umber of Tubes: 4-6K7, 4-646, 3-605, 2-6kí6, 1-5Z3, 1-645, 1-62,7,

1-685, 1-41

Frequency leangeet Land 1 140-380 K. C.

Band 2 550-1800 K. C.

Band 3 1800-5000 K. C.

Band 4 5000-14,000 h. C.

hand 5 14,000-38.000 K. C.

Alignment Frequencies: 150, 300, 456, 600, 1400, 2000, 400u, 5000, 16,000

30,000 L. C.

nand 4

Oscillator, R. F., and antenui troW+ere ore auju..ted ut 1e M. C.

Tae pander i. adjusted at 6 M. C. nepeat 12 K. C. adju.,tu0nt.

bona 5

Oscillator, R. P., nu antenna tel.:sere are acojo ettd at a W. C.

Toe padder ou tells °and fa fixed.

It a° of tae utmost lmyortance one. nakint uSO aGjuotme.t. to

keep the output no into generator just nten Amen to give a reaaalle

deflection U.S toe output meter. If strong slt,nare uro u_en to u11.n-

/scat, you: uujustmec.ts ..111 ue of very little v,lue. Thi., iota At

apply to the u...pl.l ieo A. V. C. adjust...ent:. .snore u otro... a1g,...1 is

ne cgs eery.

©John F. Rider


FADA PAGE 16-1

FADA RADIO & ELEC. CO. INC. MODEL 172

...012)Q9;

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kA-N^fUOI-O02--^er__aTNVÑ

©John F. Rider


2 FADA dC%na rr

MODEL 172 FADA RADIO & ELEC. CO. INC.

64

64

37

23

63

13

B

28

27

53

50

/146 -r--

6 A7 CONVERTER

441 AVC

CAP

44

GANGED 46! 53 - B+

BAND- SWITCH SHOWN AT IST POSITION.

SHORT WAVE BAND

26

6A7 CONVERTER

441 _ AVC 25

M..NGED

BAND -SWITCH SHOWN AT 2N° POSITION

BROADCAST BAND

46

5

B+

T4

15

1 7

5

4

6

50

C 14

53

40

31 39 48

26

T T'

B+

44

5+

T4

54-

15

©John F. Rider


FARNSWORTH PAGE 16-1

FARNSWORTH TELEV. & RADIO CORP.

BOTTOM VIEW OF 2 3 4

TOPE SOCKETS I N5GT lalCT IN5GT IM5GT p le F. AMP. , + DU OSC. I.F. AMP. DFT. -A VC AUD (wl IAOv

MODEL BT -68

5 305GT

OUTPUT

r

J z, --

11_

31

elr-e

- 1 áI A _

5 1º g, 5 HI --I TOM - r

KM `LL L'

11 ií3¡ .Il?

n 2-1440

) ß°2

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TIF R IiIí11 r Do,

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!l l

3 Mn J RA A S

.4464 ' .'1;r,,,,_!.'1;r,,,,_!_.;: (\\ î¡YY II

ro. cic.

WATTS VOLTAGE

,u.v . oecr.

IC5-0E-4555á4c-o roRlsl

Ircrcll .o .o. wl wrAc ..u:. wAu...wna

AT 117 VOLTS A.C.

-

A.C.

-

30 105-125

Ref. No. Old Part

No. New Part

No. DESCRIPTION List

Price 1 2 3 4 5 6 7 8 9

10`

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

771-24 '771-14 773-27 773-21

77-90 77-89 77-85 77-83 77-94 77-93 77-88

774-1 77-81

771-10 77-79 77-86

253-2 25-94

255-1 256-1 255-4 255-2 256-3 253-2 253-5

25-61 26-64 38-202 80-70 81-70 38-197 38-199 38-201 78-27 38-198 90-43 59-66 31-89 11-83 27-137 56-411

77218 77212 77272 77216 77260 77216

- 77267 77262 77261 77211 77214 77234 77261 77263 77257 77086 25215 25194 25194 25196 25185 25196 25054 25187 25193 25061 26064 38202 80070 81070 38197 38199 38201 78027 38198 90043 59066 31089 11083 27137 56411

1 Meg 1h Watt 10 M Ohms 1/2 Watt 4.7 Megs 1/2 Watt 220 M Ohms / Watt 330 Ohms 1/G Watt_ _ _ _

220 M Ohms / Watt_ _

33 M 1/2 Watt 1000 Ohms 1/2 Watt _ 470 Ohms % Watt 4700 Ohms 1/2 Watt 100 M Ohms 1/2 Watt 150 Ohms 1/2 Watt Wire Wound 470 Ohms 1h Watt 1500 Ohms 1/2 Watt 33 Ohms 1/2 Watt 1950 Ohms 5 Watt .1 Mfd. 600 V. .01 Mfd. 600 V. .(11 Mfd. 600 V. .05 Mfd. 600 V. .002 Mfd. 600 V. .05 Mfd. 600 V. .25 Mfd. 200 V. 250 M. M. F. Mica 50 M. M. F. Mica Elec. Condenser 2-30 Mfd.-150 V., 2-40 Mfd. 25 V._ Gang Tuning Condenser Choke _

Battery Plug Speaker and Output Transformer .-

Oscillator Coil -

1st. I. F. Transformer 2nd. I. F. Transformer Volume Control 1 Meg Wave Trap Coil Power Change Switch Knobs Dial Scale Dial Pointer Line Cord Escutcheon

$ .15 .15 .15 .15 .15 .15 .15 .15 .15 15 15

.15

.15

.15

.15

.50

.15

.15

.15

.15

.15 25 .25 .15 .15

1.60 2.40

.90

.10 4.30

.50 1.30 1.60 1.10

.45 1.50

.15

.20 .15 .35

1.35

Prices subject to change without notice.

©John F. Rider


2 FARNSWORTH MODEL BT -68 FARNSWORTH TELEV. & RADIO CORP.

THIS SIX TUBE AC -DC OR FtVE TUBE BATTERY OPERATED PORTABLE RECEIVER HAS A BUILT IN LOOP ANTENNA.' AN OUTSIDE ANTENNA MAY BE CONNECTED BY LOOSENING THE SCREW IN

THE LOWER RIGHT HAND CORNER OF THE BACK COVER. A GROUND SHOULD BE CONNECTED TO

THE SCREW IN THE LOWER LEFT HAND CORNER WHEN AN OUTSIDE ANTENNA IS USED.

ALIGNMENT

A SIGNAL GENERATOR CALIBRATED AT 455 Kc., 1400 KC., AND 1730 Kc., IS NECESSARY TO

PROPERLY ALIGN THIS RECEIVER. AFTER ALIGNING THE I.F. STAGES, REPLACE RECEIVER IN CABINET AND FASTEN LOOP IN NORMAL POSITION BEFORE ALIGNING THE R.F. END

THROUGH THE OPENINGS IN THE END OF THE CABINET. THESE OPENINGS ARE CLOSED BY

SNAP FASTENERS. THE OSCILLATOR TRIMMER IS NEAREST THE FRONT PANEL AND THE LOOP TRIMMER IS DIRECTLY BEHIND IT.

TABULATION FOR ALIGNMENT

STEPS USE IN SERIES WITH GENERATOR

SET GENERATOR AT

SET GANG AT ADJUST LOCATED To OBTAIN

1.

.O2MFD IN EACH LEAD CONNECT HIGH SIDE OF GENERATOR TO GRIR CAP OF lA/G TUBE

455 K. QUIET POINT

2ND I.F.

TRIMMERS TOP OF

l'F' TRANS.

MAXIMUM OUTPUT

1ST I.F.

TRIMMERS

2. LOOP** 1730 KC. MINIMUM OSCILLATOR TRIMMER SEE NOTE

BELOW 3. Loop** 1400 Kc.

1400 Kc. &

ROCK GANG LOOP

TRIMMER*

*SEE PRECEEDING PARAGRAPH FOR LOCATION OF TRIMMERS.

**LOOP TO CONSIST OF FIVE TO TEN TURNS OF INSULATED WIRE WOUND ON A THREE OR FOUR

INCH FORM TO BE CLOSELY COUPLED TO THE LOOP ANTENNA IN THE RECEIVER.

SUGGESTED BATTERY 1 GENERAL 60A -4L 1 RAY -O -VAC AB -87 1 BURGESS 6FA-60

VOLTAGE AND RESISTANCE DATA

1 2

1 - 1N5GT Volts open 4.2

Res. open 61

2 - 1A7GT Volts open 2.8 Res. open 40

3 - 1N5GT Vclts 0 5.6 Res. open 80

4 - 1H5GT Volts open 0

Re. open 0

5 - 3Q5GT Volts open 8.4 Res. open 9.5

S - 11736GT Volts open 117 AC Rea. open 500

3 4 5 6 7 8 Cap.

97 100 0 16 2.8 open 1.8 3500 2500 0 6 meg. 40 open 1.5 meg.

100 64 1.8 10O 1.4 100 1.8 2500 2500 200M 2500 22 2500 1.5 meg.

100 100 open 0 4.2 open 0

2500 2500 0 0 61 0 5 meg.

47 0 0 47 1.4 open 0

1 meg. 0 1 meg. 1 meg. 22 open 5 meg.

93 100 0 open 5.6 9

2500 2000 1 meg. open 80 75

117 AC 123 117 AC 0 0 123 500 2500 500 0 0 2500

NOTES: On d -c voltage readings meter should have internal resistance of at least 10 megohms. Readings taken with no signal. Line voltage 117 V. A. C.

©John F. Rider


FARNSWORTH PAGE 16-3 MODELS EK-081,EK-082, FA RNSWORTH TELEV. & RADIO CORP.

EK-083.EK-681

CW WOo pp } W O

O=äN0=0= é V

Z`u Z

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z 6 WLLÑ6 OOZZaOON

:vv =< J OOÑblOOIt{n o _NManmrm >

h

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i

IM

>

m 33 Wnn W OmOÓr=OO

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o9nna om oeerai -N.lanmr0

W Ip wow W

OOO(V=O= -Nnanmf-m

00400 n Or 0m0Om -N na nm r 0

Q O

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x o ti

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000{VO=0Z X M -NOanmAm

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® MO Ó n LL

121

m = d

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p

o

Chassis C -156,C-157, C-193

o

F

©John F. Rider RECORD CHANGER º Farnsworth P-51, RCD. CH. P.15-1


NI Qdciteotah.cd n PAGE 16-4 FARNSWORTH

MODELS EK-081,EK-082, FARNSWORTH TELEV. & RADIO CORP.

55

51R

I

SIR 55

EK-083,EK-681

50

55

SIR

AVC

46

6SK7 R -F AMPL.

SIR AP

51

51

AH

52

155

0Ó52F

Bt

BAND -SWITCH SHOWN AT 2ND POSITION CLOCKWISE.

BROADCAST BAND PUSH BUTTON TUNING

750-1600 KC. PUSH BUTTON DEPRESSED.

6SK7 R -F AMPL.

R F

35 Sip

50

55

SIR

o

AP

51 AO

I 55 5

38

55

0ó52F

8t

BAND -SWITCH SHOWN AT 2ND POSITION CLOCKWISE .

BROADCAST BANDMANUAL TUNING DIAL PUSH-BUTTON DEPRESSED

AVC 540 - 1620 KC

6SK7 R -F AMPL.

G r

BAND -SWITCH SHOWN AT 3RD POSITION CLOCKWISE .

SHORT WAVE BAND 9.4 - 15.4 MC

30

Bt ANC

l 48

27

GSA7 OSC: CONV.

1ST. POSITION (PHONO) NOT SHOWN

84

30

GANGED

30

ANC

4B

28

6SA7 OSC.CONV.

uS2RT AD

54

GSA7 OSC.-CONV.

21

B2

i4

21 t4

39

III III

©John F. Rider


FARNSWORTH PAGE 16-5

O

C

FARNSWORTH TELEV. & RADIO CORP. MODELS EK-081, EK-082jEK-083.EK-68)1

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u ú y 2f. $ ` ' ro

= "..2 `-s m: c e! ú N E° ? E ó .__ .. Y r _ ti 'ÿ

V ' V

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< < ` a V ' y 0.'

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>, } rn .1i ó < :

. d m íu. .] ÿ á a v¿ r Xz E ÿ E

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V 3 4^ 9 Ç ú ätA v e « w a

g 3 ß du,.ox 3 c ó. C N ° a ÿ ¿ E w O "e. ...

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b

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on-;',1,-J! ° ó c.i do i « -iç

< Á ,c' á « ú .E

©John F. Rider


6 FARNSWORTH MODELS GK -190. FARNSWORTH TELEV. & RADIO CORP. GK -141, GK-1442,GK-143.GK-144,, Preliminary

EQUIPMENT REQUIRED

FM Signal Generator,

22.5 Kc deviation.

Output Meter.

FM GAIN MEASUREMENTS

Output meter connected across secondary of out - modulated at 400 cycles, put transformer, 4 ohms impedance. Signal gen-

erator connected at gang capacitor. Volume control, Bass control and Treble control at maximum.

SIGNAL GENER- ATOR TO DUMMY INPUT OUTPUT OUTPUT GAIN

Ant. 330 ohms 20 .5 watt 1.5X

4.33X

RF .1 Mfd. 30 .5 watt

Cony. Grid .1 Mfd. 130 .5 watt

(1)

(3)

(2)

(4)

F -M

AL I GI?l"E21T

OSCILLOGRAMS

These curves were obtained under ideal conditions and show curves to be expected. They should be duplicated as nearly as practicable.

©John F. Rider


Tertlary Winding 14-1030

23821 WhitG

Whitt

Blue ANT.

Black

N

O

0

Yellow 200

IN5G zsëzz

100000 w

ó á 0

AVIATION "5" Baflery - Operated Superheterodyne

195 kc to 410 kc Receiver

I. F. = 465 kc

IA7G 40-e741 IN5G

J @lue

o

Cree

o gack

Red

o o

áf

immE N1tA

o V4 w, o

IHSG 1G-5743

0 o

ti O

.0I 400

01489 SCHEMATIC

CIRCUIT DIAORIAM

IC5G g,uf 0../ put Trarsi Or. ;.eeaiter

N

L--- --- 3Garg 365...fd.

Red

If excessive gain is encountered add a 50 mmfd condenser across the primary of the 14-1031 RF coil.

Green 1

óál 72 óT

0 22-7004

.o/ Nominal

23823 Setting 200 .4.4.4.4f41

14-1032

Da 0

-A

1

-8 +A 15v.

MEISSNER

JI69 www.americanradiohistory.com

- ---- --


FARNSWORTH PAGE 16-7-8

VOL7.ft I Nesnu«u 3O674e2 0 0 1.5

164 1011 133 7M0 5Nr 50 e Itlaw 4l) 00woe.. MO 00a0 t1M ,t 7570.. ,].s

13 C a.t...

FM SOC

ANl SET

IX 400 KC

TAG? FM RF AMP

t

FARNSWORTH TELEV. & RADIO CORP.

2 0E]IS7/N6t 60,6610, 3 515674,NCt 001.r.3[ 4 Ncslsr.Nu VotT.Oc 5 IIt31sr.NCt VOLTAGE 6 0tS1ST05Ct vetT.O[ 7 NtsISr/NO[ VotTOt B Nc{It7.Nc[ Votr1S[ I!!OY 10 10 10a 10 10 IO 10

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O0050 u11r Si 0 {{/-. m s66.. 3106 O O teto.. so O O 51.31166 !IfSY OIM 6110{ lJ OW /1t0 d tN1 4100 Q OIYI INC 1 O INC 6'] Q 2yY 690 SIN/ tNO ,. 70 70 70

or 10 70 76.3 AC ,.l.. 70 )O }0 fa.].0 /130 61M SOSO 0Nr 6f50 OINi O.t 060Y 06.].G b.t.. /If

BLue

WHITE

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GR

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C.)1150 MMF

220

_ =X. 2 MMF\

1500 \ MMF

3.3 X

600 KG

2 GAGS

FM. CONY

6 56M IM

R.F.0

72

F

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600 1500 MMF MMF -.

1500 MMF

32 X

455 KC

H IF TRANS

22M 1

A M. ANT SOCKET

WHITE

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A.M. ANT. PLUG /(PRONG END)

SEC 3 FRONT

C6 - _ CI

C5 2

C4

100 M

3

SEC 3 REAR

100..

13 - 6SK7

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MMF

46-

55. MMF

R

T

MFD

Z 600 4700 n MMF 191W .IMFD I 29

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ice GANG

PROGRAM SWITCH IS IN EXTREME COUNTER -CLOCKWISE POS (11 B IS SHOWN FROM GEAR ENO OF SWITCH. POS I -PHONO

2-A M

3-F M. 4 -SHORT WAVE

ALL POINTS MARKED IF) CONNECTED TO UNGROUNDED SIDE OF 6.3 VOLT WINDING ON POWER TRANSFORMER.

VOLTAGE MEASUREMENTS TAKEN WITH VACUUM TUBE VOLT METER, NO SIGNAL, A.V.C. INOPERATIVE.

>_

85

84

H7

I I

Y

JJOOM05 M TIOOM

B2

SEC 2

FRONT 83

HI

H6 %1 " H2

07 H5

S.W. PAD

SEC 2 REAR

IOC..

H3

+3: 6SK7

AM -FM.)!! 1.1

.05 MID

10 6SA7

A.M. CONY. OSC

á .? 95 -le

455 KC

.OS MID

IM

.05 MF21.10

21D I.F. TRANS

,X

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51

1

1 - J

100 M

3

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56 X

400 CY

4 6SK7

FM. 252 1.1

B

7 a F

1500 MMF 68..

002 MFD

322 1.F TRANS

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4

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11.5 X

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X X 1500 MMF 6 ¡ -1

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220.. _ O21M

6 6H6

RATIO DET.' F.M.AVG

IOO M

AA+

470 M 47 M

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M 6

MMF

47MMF

100 MEGI

2.2 MEG II

02 MIO .015 MID

7 8

IO MEG

6507 AM DET

IS! AUDIO B AVG

II 6507

PHASE INV.

SEC 4 FRONT

o o 01

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43t REAR

John F. Rider

3

I MEG TREBLE

470 M

.01 MID

470

.02 MFD

F

1Ó MEG

MF

G) 220 M

220 M

220 M

03 MFG?

330

5

2 7

IMEG ti".

3 200 MMF () ()

68 M

4 MFD 68 M B

200 MMF

R. F C.

22 M

5

50 MI+025V -11

SW

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2

9 4 6V6GT

7

= F

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SEC 5 FRONT

E

E2

E4 E3

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OUTPUT

SPKR PLUG (PRONG END)

BLUE

_zs).

BLUE-.

12 3 MEG 6V6GT

VOL .005 OUTPUT CONI MFD

2.2 MEG BASS

500.. 5W 500..5

MFD U

MFD

BC

SW

FM

BLACK

SPKR SOCKET (WIRE END)

BLACK

.-RED

40 MID

PHONO MOTOR

14 5U4 REGT

YELLOW

YEL 5v 8

4

YELLOW -RED

RED

S

RED

GREEN

6.3V 4 GREEN

7777

PHONO SWITCH -GANGED ON PROGRAM SWITCH.

^4.005 MFD

r 011 VOL. 0OSITROL

MODELS GK-140,GK-141, GK-142,GK-143,GK-144,, Preliminary

BOTTOM VIEW OF I.F. CANS

BUS TO PIN 4 (TUBES)

1ST I.F. TRANS

2ND I.E TRANS

SPRING

10.7 MC

3RD I.F. TRANS

DET. TRANS

US TO PIN 8 (TUBE 4)

BUS 39 M.. Ì IOO M

M

BUS TO PIN 8 (TUBE 5)

39 M..-

100161...


"cia/uPeci tichefflalici. it FARNSWORTH PAGE 1Sz9

FARNSWORTH TELEV & RADIO CORP, MODELS' GK-140,GK-141,

GK-142,GK-143,GK-144, Preliminary

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PAGE 16-10 FARNSWORTH MODELS FARNSWORTH TELEV. & RADIO CORP. GK-140,GK-141, GK-142,GK-143,GK-144, .Preliminary

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FARNSWORTH PAGE 16-11 FARNSWORTH TELEV. & RADIO CORP. MODELS

GK-140,GK-141, GK-142,GK-143,GE-l44,

Preliminary

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D


FEDERAL PAGE 16-1

FEDERAL TEL. & RADIO CORP. MODEL E1025TB

POWER OUTPUT RATING:

VOICE COIL IMPEDANCE

POWER REQUIREMENTS

TUNING RANGES:

ANTENNA:

8 of

TO EXTERNAL ANTENNA

18

For 105-125 v. operation: Undistorted 1.1 watts; maximum 1.5 watts. For 210-250 v. operation: undistorted 1.9 watts; maximum 2.8 watts. 3.2 ohms st 400 cycles.

30 Watts at 105-125 volts 50-60 cycles AC, or 105-125 volts DC. 60 Watts at 210-250 volts, 50-60 cycles AC, or 210-250 volts DC. Broadcast Band 540-1600 kilocycles (555-188 m) International Short Wave Band 6-18 megacycles (50-16.65 m). External.

5 TUBE AC - DC RECEIVER - 2 BAND -MODEL EI025TB -117/235 V vi, v2 V3 V4

12BE6 12BA6 12AT6 50L6 -GT CONVERTER IF AMPLIFIER 2ND DETECTOR POWER AMPLIFIER

IST AUDIO AMPLIFJE Cle IDE

Cm Ti a T oa 0." Sr it TM. MS

220

MOTES

YID SIYTEJ> NUYM IM E C MYTIOI (O E I BALLAST TUSE UV» IN Hl 401.4 2051TION

I. F. FREQUENCY:

AVC 517K

OV 0^

34VAC 34-"-

OV Q^

e.evoc I 50^

B4VAC eo^

TUBE SOCKET CONNECTIONS

46VDC NOTEI

-0.7VAC

50L6/6T

0 MEG

455Kc

25E6

1-- OOST YFO

SYITGM 04-OFf

/4- cif I 1

2 WD

99VDC NOTEI

99VDC NOTEI

24VAC 24

34 VEC

35

IIOVDC 117VAC jI

NOTEI 1110^

98VDC 0V NOTE I

4070K V

l [eBO^.C

OV 0^

84VAC I BD^

12BA6

BAL.

aD 1 r 12555 C13

á

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30 V

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1 SSMM 5

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SOL6GT 128i16 128E6

12610

2 5VDC

-0.2VDC 2 67MEG

OV

0^

114VAC

60^ 118VDC NOTE

108VDC NOTE 1

98VDC NOTE 1

Tf

SQLS

-0 2VDC 3.67 MEG

IIIVAC 140^

IIIVAC 140^

114 VAC

160^ 84VAC 110^

2TOn

Vg

2 RECTIFIER 35574 PILOT LIGNTS

-3.8VDC 22K

0.1VDC OS^

24VAC 24-^

I 2.S VAC

3^

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OV

0^

OV 0^

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MOTE,

M.V. GONOEIISEM ME 00V, UNLESS onetime

SPECIFIEO ALL NCSIST0e0 ME OS WATT muss 04.(41 -

In AC IRUCIED.

RiY

NOTE II RESISTANCE READINGS AT.THESE POINTS WILL VARY SINCE THEY ARE IN SERIES WITH THE LEAKAGE RESISTANCE OF THE

ELECTROLYTIC CONDENSERS WHICH IS SUBJECT TO CHANGE.

Voltage and Resistance Analysis Chart

Resistance readings at these points will vary since they are in series with the leakage resistance of the electrolytic condensers which is subject to changes. All D.C. measurements were made with a meter having a sensitivity of 20,000 ohms per volt. Ac measurements taken at 1000 ohms per volt. Measured values are from socket pin to circuit ground (pin A3 of 12AT6 socket). Tolerances of component values make possible a variation of 20% in readings indicated in chart. Socket connections are shown as bottom views.

©John F. Rider


2 FEDERAL MODEL E1025TB FEDERAL TEL. & RADIO CORP.

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©John F. Rider


FEDERAL PAGE 16 -

FEDERAL TEL. & RADIO CORP. MODEL E1O25TB

ALIGNMENT INSTRUCTIONS Punch marks are provided on the dial back plate at 600 Kc_, 900 Ke, 1500 Kc and 1600 Kc for alignment purposes. With tuning condenser fully open, se Connect ou'cput meter across voice co Connect low side of signal generator Connect high side of generator throu Keep signal generator output at lowe maximum output meter reading in each

MP

,

C7- C5 -- C6 ---

G8-

C3

DUMMY ANTENNA

.1 MFD

200 MMFD

200 MMFD

200 ? FD

200 MAD 400 OHMS

400 GAMS

BAND SWITCH

12BE6 )

t dial pointer to the 1600 Kc punch mark. it terminals on speaker frame. lead through a .1 mfd coupling condenser to chassis ground.

gh proper dummy antenna to external antenna lead. st practical level and'make the following adjustments for case.

TUNING

CONTROL VOLUME CONTROL

ELECTRO- LYTIC

I IF TRANLSF. 455KC n S I

35W4

\./ 12 BA6

-S2

THtS POSITI . P13 FOR 105- ! 25 V OPERATION

DIAL

2.42 IF TRANSF.

455KC S3

0--- -S4

THIS POSITION

FOR 210-250V. OPERATION

50 L6 GT

Top View of Chassis Showing Alignment Adjustment Positions

SIGNAL GENERATOR FREQUENCY

455 Kc

1600 Kc

1500 Kc

600 Kc

900 Kc

18 Mc

17 Mc

ALIGNMENT CHART

BAND SWITCH

POSITION

B. C.

B. C.

B.C.

B.C.

B.C.

S.W.

RECEIVER DIAL

SETTING

Tuning Condenser Fully Open


1500Kc

Rock at 600 Kc

900 Kc


1500 Kc

ADJUSTMENT POINTS

S1,S2,S3,S4

C3

C8

C6

Check Osc. Crossover

C5

C7

DIAL LAMP

©John F. Rider


4 FEDERAL MODEL E1025TB FEDERAL TEL. & RADIO CORP.

R6

C10

C23

CII

C14 - T2

V3

R7

R I O

R8

C13

C12

V 4

SCHEMATIC NO. OF PART

C1 C2 C3 C4 C5 C6

C7

C8

C9

C10 C11

C12

C13

C14

C15

C16

C17

CI8 C19

C20

C2I C22

C71 SI C22 LS! T3

C9 617

C16 RI6 RI5 R9 V2 RI3 TI

DESCRIPTION

2 Gang Variable Part of Cl Part of C2 56 mmfd Mica 10% 500 V D.C. Working Compression Trimmer 3.0-35 mmfd Compression Trimmer 70-470 mmfd (part of CS) Compression Trimmer 3.0-35 amid (part of CS) Compression Trimmer 3.0-35 ninfd (Part of C5) .05 mfd., Tubular, Paper, 400 V D.C. Working 100 mmfd Ceramic, 20%. (Part of T2) .01 mfd., Paper, Tubular, 400 V D.C. Working .01 mfd., Paper, Tubular, 400 V D.C. Work in g

.01 mfd., Paper, Tubular, 400 V D.0 Working .0015 mfd., Paper, Tubular, 400 V D.C. Working .2 mfd., Paper, Tubular, 400 V D.C. Working .05 mfd, Paper, Tubular, 400 V D.C. Working Electrolytic 2 Section Common Cathode 40 mfd. 250 DCV'V, Sect. I 40 mfd. 250 DCWV, Sect. 2 Part of C17 .005mfd., Paper, Tubular 600 V D.C. Working .005 mfd., Paper, Tubular 600 V D.C. Working 220 mmfd., mica, 20% 500 V D.C. Working 100 mmfd, mica, 20%, 500 V D.C. Working

Cié L2 C4

RI CI5 I R2 I VI R I V5 C20 RI

C24 i

SCHEMATIC NO.OF PART

C23 C24 C25 C 26

11, 12 LI

L2 L3 L4

LS1 R1 R2 R3 R4 R5 R6

R7

R9 R10 R11 R12 R13 R14 RI5 R16 61 S2 T1 T2 T3

V1 V2 V3 V4 V5

DESCRIPTION

S2

C 26

-C7

C5

L4

6

-08 625

-C19

-L3

.01 mfd., Paper, Tubular, 400 V D.C. Working 7500 mmfd., mica, 10% 500 V D.C. Working 220 mmfd., mica, 10% 500 V D.C. Working 15 mmfd., mica, 10% 500 V D.C. Working 3.2 V 160 MA. Miniature Bayonet Base Pri. Inductance 3600 uh, Sec. Inducatnce 203.5 uh 1% Sec. Inductance 1.5 uh, 3% Sec. Inductance, 98.5 uh, 1% Sec. Inductance, 1.4 uh, 3% 5" P.M., 3.2 ohm V.C. 22000 ohms, 20% 1/2 watt carbon LO megohm, 20% 1/2 watt carbon 2.2 megohm, 21% 1/2 watt carbon 47000 ohms, 2)% 1/2 watt carbon (Part of T2) 0.47 megohm, 20% 1/2 watt carbon 2.0 megohm, Taper 0.2 megohm at 1/2 rotation, with "ON-OFF" Switch 10.0 megohm, 20% 1 1/2 watt carbon 0.22 megohm, 20%, 1/2 watt carbon 0.47 megohm, 20%. 1/2 vatt carbon 150 ohms, 10%, 1/2 watt carbon 270ohms, 10%. 1/2 watt carbon 1800 ohms 5%. 2 watt carbon 410/200 ohms 47000 ohms, 20%, 1/2 watt carbon 680 ohms, 5%, 1 watt carbon 330 ohms, 10%. 1/2 watt carbon Part of R6 Wafer Switch Double Tuned, 455 Re Double Tuned, 455 Kr Fri. Imp. 2500 ohms, Sec. Imp. 3.2 ohms, Humbucking Winding 12BE6 12BA6 12AT6 50L6 -GT 3514

©John F. Rider


FEDERAL PAGE 16-5

FEDERAL TEL. & RADIO CORP. MODELS 1030T.1540T

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\\ d delseN'tCK.1ti('.d PAGE 16-6 FEDERJ.

//

MODELS 1030T.1540T FEDERAL TEL. & RADIO CORP.

C19

L1

AVC

L3 PRI.

o i 52

6SS7 R -F AM PL.

V1

e

CT a

RIG

R12

C.B.I DENOTES COMMON BUS ABOVE GROUND BY

C14 (.2/U f )AND R12 (22010.

C19

L1 PRI

L3

CS

C20

R17

C B. B+ 5+

L4

C18

C14

GANGED

S2

J

BAND -SWITCH SHOWN AT 1 ST POSITION. BROADCAST BAND

550-1600 KC

52

C3

DENOTES COMMON BUS ABOVE GROUND BY C14 (.2,.1f) AND R12 (220K).

C1

S2 -o

R18

AVC

C4

C2

GANGED I

12SA7GT CONVERTER

V2

12 SA7GT CONVERTER

V2

Ti

T1

S2

BAND- SWITCH SHOWN AT 2ND POSITION.

SHORT WAVE BAND 5.6 - 15.5 MC

R12

I S2

G

C14

C21

B+

©John F. Rider


FEDERAL PAGE 16-7

FEDERAL TEL. & RADIO CORP. MODELS 1030T.]540T

AVC 547K

[220V

82V D -C NOTE I

37VA-C 430-

+55V D -C NOTE 1

22'5 8

_ 7

OV Onl

[0.57V D -C IOMEG

OV 220 K

12 SQ7/GT

VA -C 14 n

+4.7V D -C 120n

OV On

65VA-C 95n

31VA-C 32.0-

40. 5

+85VA-C NOTE I

6SS7 0V On

-0.2V D -C 1.5 MEG

+0.55V D -C

220n

N.C.I

0-- 37VA-C

8 I

41 n

7 ö 30 8 _ 4

50L8/GT

IIOVD-C NOTE I

60V D -C NOTE I

0V 470 K

-58V D -C 22K

+83V D -C NOTEI

+78 V D -C NOTE I

125A7 GT/G 24VA-C 25.0.

+66V D -C NOTE I

31VA-C 32n

OV 0.8n.

> d 5 8

7

8 2 I

8.3 V A -C 17n

1.3V D -C 1.5MEG

o OV

6SS7 RF

OV 220K

+63V D -C NOTEI

220K

24VA-C 25n

1 2

+2V D -C 470 n

120V D -C NOTE I

0V

-0.2V 1.4 M

TIE POINT

1 2 a 3 122.,

115 V A -C

125 n

85V A -C 95n

6 5

TIE POINT

112 V A_C

TIE POINT

3525/GT 112VA-C

122 n

Fig. 4. Voltage and Resistance Analysis Chart

1. Resistance readings at these points will vary since they are in series with the leakage resistance of the electrolytic condensers which is subject to change.

2. All D.C. measurements were made with a meter having a sensitivity of 20,000 ohms per volt. A.C. measurements were made with e 100u ohms per voltnetet.

3. Measured values are from socket pir to circuit ground. (pin 8 of 12SQ7 socket). 4. Tolerances of component values make possible a variation of ± 20% in readings indicated in chart. 5. Socket connections are shown as bottom views.

SCHEMATIC NO.OF PART

C 1

C 2

C 3 C 4 C 5

C 6 C 7 C 8 C 9 C 10

C 11 C 12 C 13 C 14 C 15

C 16

C 17

C 18 C 19 C 20

C 21 C 22 C 23 C 24 C 25 I1, I2 L1 L2 L3 L4 LS1 R1 R2 R3 R4 R5

R6 R7 R8 R9 RIO P.11

RI2 R16 R17 R18 S1 S2

12 T3

V1 V2 V3 V4 V5 V6

NAME OF

PART

Capacitor

Lamp Inductor

Speaker Resistor

Potentiometer

Resistor Resistor

Switch

Transformer

Tube

DESCRIPTION

2 Gang variable Part of C 1

Part of C 1

100 mmfd mica ± 10% 500 v D.C. working Compression trimmer 70-470 mmf Compression trimmer 1.6-18 mmf(part of C 5) 3000 mmfd mica ± 10% 500 v D.C. working .05 mfd, tuhular,paper,400 v D.C. working 125 mmfd mica, ± 25% pert of T2 .01 mfd,paper,tubular 400 v D.C. working .0015 mfd, mica± 20% 500 V C.C. working .01 mfd, paper tubular 400 v D.C. working .01 mfd, paper tubular 400 v D.C. working .2 mfd paper tubular 400 v D.C. working .05 mfd paper dielectric 400 v D.C. working Electrolytic, 2 section Common cathode 40 mfd 150 DCWV Sect. 1

40 mfd 150 DCWV Sect. 2

Part of C 16 .1 mfd, paper, tubular 400 v D.C. working .002 mfd. paper, tubular, 600 v D.C. working 470 mmf.mica ± 20% 500 v D.C. working

Part of T1 Part of T1 Part of 12 Part of T2 100 mmf.mica ± 10% 500 v D.C. working 3.2 v, 160 ma.miniature bayonet base 200.5 uh ± 1 uh;dist.cap.l2mmf max. 2 band osc coil assy. SW. RF Coil Slug tuned, variation 30-S5 uh ± 10% 5" p.m., 3.2 ohm v.c. 22000 ohms + 20% 1/2 wett carbon 1.0 megohm 20%, 1/2 watt carbon 220 ohms ± 20%, 1/2 watt carbon 47000 ohms, ± 20%, 1/2 watt carbon Part of T2 500,000 ohms taper 50,000 ohms at 1/2 rotation, with "on -off' switch 10.0 megohm T :20%. 1/2 watt carbon 0.22 megohm + 20%, 1/2 watt carbon 0.47 megohm ± 20%, 1/2 watt carbon 120 ohms ± 10%, 1/2 watt carbon 270 ohms ± 10%. 1/2 watt carbon 1500 ohms ± 5%, 1 watt carbon 220,000 ohms ±20%, 1/2 watt carbon 470 ohms ± 20%, 1/2 watt carbon 4700 ohms ± 20%, 1/2 watt carbon 0.1 megohm ± 20%, 1/2 watt carbon Part of RS 4 pole, 2 position Double tuned, 455 kc.

Primary Impedance 2500 ohms,secondary3.2 ohms, with humbucking winding 6SS7 or 6SS7/GT 12SA7/GTG 6SS7 or 6SS7/GT 12SQ7/GT 50 L6/GT 35 Z5 / GT

FUNCTION

Ant. Tuning OSC: Tuning Ant. Trimmer osc Grid coupling S. W. Padder B.C. trimmer I.F. trap AVC bypass Diode load bypass 1st audio coupling 1st audio plate bypass 2nd audio coupling Output tube Plate bypass Line bypass Line bypass

Filter

Filter Cathode bypass,rf tube External Ant. Coupling Coupling,Grid of convertor tube 1.F. Trimmer

Volume Control bypass Dial light Loop Antenna Oscillator Coil Antenna Coil I.F. Trap Speaker Oscillator grid AVC Coupling I.F. Cathode Volume control decoupling

Volume control 1st audio grid 1st Audio plate Output tube grid Output tube cathode Pilot light shunt Filter Chassis return Cathode R.F. tube Plate R.F. tube Grid of Mixer tube oe-Off" Band -Switch I.F. input I.F. output Audio output

R.F. amplifier Converter I.F. amplifier 2nd Det.lst audio Power output Rectifier

©John F. Rider


8 FEDERAL YODELS 1030T,1590T FEDERAL TEL. & RADIO CORP.

POWER REQUIREMENTS: 30 Watts at 105-125 Volts AC, 50-60 Cycles or 105-125 Volts DC.

TUNING RANGE: 2 Bands. American Broadcast 550-1600 1(C. International Short Wave 5.6-15.5 MC.

ANTENNA: Built in loop with facilities for connection to external antenna.

BAND SWITCH

DIAL /I --DIAL LAMP

e

Ce

C5

0 E C3

ELECTRO- LYTIC

35Z5- GT/G

RECTIFIER

L4

TUNING CONTROL

12 SA7- GT/G

CONVERTER

85S7 - GT

RF AMP

VOLUME CONTROL

1sT IF TRANSFORMER

455 KC

® ® C21 C22

e557 - GT

IF AMP

S0L8- GT

POWER OUTPUT

Q DIAL LAMP-+yl-

2ND IF TRANSFORMER

C23

® 455 KC

® C24

I2507- GT/G

2ND DET 15T AUDIO

I

Fig. 1. Top View of Chassis showing Alignment Adjustment Positions.

6

ALIGNMENT INSTRUCTIONS Punch marks are provided on the dial back plate at 600 kc, 100G kc, 1400 Kc and 1600 Kc for alignment purposes. With tuning condenser completely open, set dial pointer to 1600 Kc punch mark. Connect output meter across voice coil terminals on speaker frame. Connect low side of signal generator lead thru a 0.1 mfd coupling condenser to chassis ground. Connect high side of generator thru proper dummy antenna to the receiver external antenna connec- t ion. Keep signal generator output at lowest practical level and proceed according to table below.

ALIGNMENT CHART

DUMMY ANTENNA

SIGNAL GENERATOR FREQUENCY

BAND SWITCH

POSITION

RECEIVER DIAL

SETTING ADJUSTMENT

POINTS

OUTPUT METER

RE AD 'I NG

0.1 MFD. 455 Kc B.C. Tuning Condenser Open C24,C23,C22,C21 Max. 0.1 MFD. 455 Kc B.C. Tuning Condenser Open L4 Pain. 200 MMFD. 1600 Kc B.C. Tuning Condenser Open C6 Max. 200 MAD. 1400 Kc B.C. 1400 Kc C3 Max. 200 MMFD 600 Kc B.C. 600 Kc L1 Max.

(Check, adjust if necessary)

400 ohms 6 Mc S.W. 6 Mc _

C5 Max.

©John F. Rider


FIRESTONE PAGE 16-1

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ALL SOCKETS AND PLUGS SHOWN FROM PIN END VIEW ALL SWITCHES SHOWN IN COUNTERCLOCKWISE POSITION, $HAFT END VIEW

SYMBOL PART NO. DESCRIPTION LIST

PRICE

C-1 C -2A, C-3

C-4 C-5 C-6 3-7 C-8 C-10

C-11 C-12 C-13 C-14 C-15 C-16 C-17

BD410503 B C-57243-1

BM74A101

BD410503 A-58154 BD210503 BD410104 BD410103 BM74A22I

BD610902 BD410104 BD410203 BD410104 BD410203 BD410203 BD610502

CAPACITORS

Capacitor -.05 Mfd., 400 volt $ .35 Capacitor -Variable gang 4.50 Capacitor -Mica 100 Mmfd. ± 20% .35 Capacitor -.05 Mfd., 400 volt .35 Capacitor -Electrolytic. 40-20-10 Mfd., 150 volt 1.80 Capacitor -.05 Mfd., 200 volt .30 Capacitor -0.1 Mfd., 400 volt .40 Capacitor -.01 Mfd., 400 volt .30 Capacitor -Mica 220 Mmfd. ± 20% .40 Capacitor -.005 Mfd., 600 volt Capacitor -0-1 Mid., 400 volt Capacitor --.02 Mfd., 400 volt Capacitor -0.1 Mfd., 400 volt Capacitor -.02 Mfd., 400 volt Capacitor --.02 Mfd., 400 volt Capacitor -.005 Mfd., 600 volt

RESISTORS

.30

.40

.30

.40

.30

.30 .30

R-1 BR17B224 Resistor -Carbon, 220,000 Ohms, 1/2 watt..... .15 R-2 BR17C221 Resistor -Carbon, 220 Ohms, 1/2 watt .15 R-3 BR17B473 Resistor -Carbon, 47,000°Ohms, 1/3 watt .15 ßf-4 BR17B103 Resistor -Carbon, 10,000 Ohms, / watt .15 R-5 BR17B156 Resistor -Carbon, 15 Meg., 1/3 watt .15 R-6 BR17E103 Resistor -Carbon, 10,000 Ohms, 1 watt .15 R-7 BR17B102 Resistor -Carbon, 1,000 Ohms, '/s watt .15 R-8 B-56142-1 Control -Dual Potentiometer, with switch

500,000 Ohms,'(V. C.) 2.25 R-9 BR17B335 Resistor -Carbon, 3.3 Meg., / watt .15 R-10 BR17B685 Resistor -Carbon, 6.8 Meg., / watt .15 R-11 BR17B154 Resistor -Carbon, 150,000 Ohms, 1,2 watt .1-5 R-12 BR17B154 Resistor -Carbon, 150,000 Ohms, 1/3 watt .15 R-13 B-56142-1 Control -500,000 Ohms, (T. C.) part of R-8 ' R-14 BR17B472 Resistor -Carbon, 4.700 Ohms, 1/2 watt .15 R-15 BR17B104 Resistor --Carbon, 100,000 Ohms, / watt .15 R-16 BR17B474 Resistor -Carbon 470,000 Ohms, ,A watt .15 R-17 BR17B104 Resistor -Carbon, 100,000 Ohms, / watt .15 R-18 8á17B104 Resistor -Carbon, 100,000 Ohms 1/3 waist .15 3-19 8á17B474 Resistor -Carbon, 470,000 Ohms, / watt .15 2Z-20 BR17B474 Resistor -Carbon, 470,000 Ohms, 1/2 watt .15 d-21 BRI6C101 Resistor -Carbon, 100 Ohms, ± 10% / watt .15 5-22 BR17G470 Resistor -Carbon, 47 Ohms + 20% 2 watt .30

SYMBOL PART NO. DESCRIPTION LIST PRICE

COILS AND TRANSFORMERS L-4, 5 D-57259 Loop Antenna assembly $1.00 L-2 B-56143 Coil -Oscillator assembly * L-3 E-51728.1 Filter Choke, 80 ma. 2.00 T-1 B-51010-3 Transformer-lst I.F 2.00 T-2 B- 1011-3 Transformer -2nd I.F. 2.50 sf -3 B-572534 Transformer -Output 1.50

OTHER ELECTRICAL PARTS SW -1 Switch -power part of R-8 and R-13 SW -2 B-56156-1 Switch -Radio -Phone 1.00 SP -1 C-57872 Speaker -6" x 9" Permanent Magnet

A-6158 Lamp -Dial Mazda No. 47 .15 MISCELLANEOUS PARTS

B-57275.1 Background for dial A-54848 Bushing -Strain relief (power cord) .20 A-56155 Bushing --Tuning control shaft

-

E -57270.1 Cabinet B-51330-1 Channel rubber-mtg. for Dial scale .04 B-55402-1 Dial Cable assembly (includes clips at end

of cable) .25 B-57269-1 Dial scale -plastic* B-51427-2 Grommet ---rubber; mtg., for variable gang .05 B-51124-1 Knob --Volume ó switch, tuning or radio -phono .15 B-56138-1 Knob -Tone Control .15 BN751V02 alnut---No. ..,-32; for mtg., controls .02 BN770S02 Palnut-No. 10-24; for mtg., record changer .01 A-57271 Plug -3 Prong -Phono pick-up connection ' B-55130-9 Pointer

.15 B-58069-1 Power Cord 75 BP934G02 Screw -No. 4 x 1/2"; for mtg., loop & back .03 BP928NO2 Screw --No. 8 x 11/R"; for mtg., chassis .03 BS016S09 Screw -No. 10-24 x l','; for mtg., record changer .04 A-56136 Shaft -tuning Control R

A-54726 Socket -octal base .20 A-54900 Socket-loctal base 25 A-57273 Socket -3 Prong; Phono pick-up & loop antenna .20 A-57258 Socket --2 Prong; speaker connection .20 A-6182-5 Socket -dial lamp (with leads) .15 A-51331 Spring-Mtg., for channel rubbers .10 A-51787 Spring --dial cable tension 07 A-50147 Spring --conical; for mtg., record changer .10 BF13NTO5 Washer -flat; for mtg., record changer- .02 B-50156.1 Washer --rubber; for mtg., record changer .04 A-54492 Washer -"C"; tuning shaft .02 A-1089 Washer -cup; variable gang mtg. .05 B-50964-3 Wirenut-phono motor power connection .03

©John F. Rider RECORD CHANGER: Detróla 550, RCD.CH. P.15-1


FIRESTONE PAGE 16-3

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MODELS 7379-1,7405-3, THE FIRESTONE TIRE & RUBBER CO. 7406-1

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©John F. Rider


4 FIRESTONE VI ' delf¢matiCd rr

MODELS 7379-1,7405-3, THE FIRESTONE TIRE & RUBBER CO. 7406-1

20 39A

46 39A

35 16

AVC

53

43C

- GANGED- - BAND- SWITCH SHOWN

AT 1ST POSITION. BAND I.

SHORT WAVE BAND

20 39A

44 39A

34 43C

AVC L - GANGED-

BAND -SWITCH SHOWN AT 2ND POSITION

BAND 2 POLICE BAND

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©John F. Rider


FIRESTONE PAGE 16-5

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©John F. Rider


6 FIRESTONE

Diag. Part List No. No. DESCRIPTION Price

20 83783 .00011 mfd. mica condenser $0.16 21 83803 12 mfd. 15 volt electrolytic con-

denser .80 84235 1.1 meg. 1/4 watt resistor .20 84240 4000 ohm 1/4 watt resistor .20 84850 .03 mfd. 750 volt paper condenser .25 84888 300 ohm 1 watt resistor .20

84958 1 Two -gang variable condenser j 4.50 j with shaft coupling 4 mfd. 400 volt electro-

lytic condenser 27B J 8 mfd. 400 volt electro-

lytic condenser

84961

MODEL 7383-4 THE FIRESTONE TIRE & RUBBER CO.

6A7 IL! Of r i OSC. r- _----

TUBE LOCAT1oNS

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I

6D6 LI.

I.F. FREQUENCY 456 KC. I-

Diag. Part No. No. DESCRIPTION 1 66875 16,000 ohm 1 watt carbon resistor 2 81630 .1 mfd. 100 volt paper condenser. 3 81812 .00051 mfd. mica condenser 4 83007 .02 mfd. 600 volt paper condenser 5 83058 .25 mfd. 100 volt paper condenser. 6 83063 .5 mfd. 100 volt paper condenser.. 7 83080 51,000 ohm 1/4 watt resistor 8 83082 260,000 ohm 1/4 watt resistor 9 83179 Tone Control switch

10 83207 Fuse

75 201 DET. AMP.

0 AMC.

41 OUTPUT

I R -23I ISPEAKER

List Diag. Part List Price No. No. DESCRIPTION Price .$0.50 11 83278 Pilot lamp $0.15 . .30 12 83353 .05 mfd. 100 volt paper condenser .30

.25 13 83539 .00026 mfd. mica condenser .25 . .35 14 83706 .006 mfd. 600 volt condenser .35 . .35 15 83725 0-500,000 globar resistor .45 . .45 16A) j Volume c )ntroll

.20 16B J 83728 j On -Off Switch) 1.20

.20 17 83730 R. F. Choke .25

.30 18 83777 Battery lead and fuse housing .50 .05 19 83778 Light cable and plug assembly .50

22 23 24 25 26A j 26B J

27A j

l 28 84962 Filter choke 29 84963 Oscillator coil assembly 30 84969 Antenna coil and shield assembly 31 84972 1st I.F. transformer assembly 32 84974 2nd I.F. transformer assembly 33 84975 Power transformer 34 84977 Battery lead and cap' (to chassis) .34 35 84978 Antenna lead .40 36 84979 250 ohm 1/2 watt resistor .15 37 84995 Vibrator 5.00

38 85027 Speaker cable .30 39 85029 .1 mfd. 300 volt paper condenser .40 40 85048 Filament R.F. Choke .25 41 85376 Diaphragm and voice coil assembly 2.00 42 85378 Output transformer 43 85379 Field coil

2.50

1.25 1.00 1.25 2.75 2.75 3.50

Part List No. DESCRIPTION Price

17166 Mounting nut $0.05 83144 15,000 ohm spark plug suppressor .35 83145 10,000 ohm distributor suppressor .36 83319 Fuse insulator tube .02 83737 Top cover knurled nuts .06 84981 Tube shield section .08 84982 Tube shield section (slotted) .08 84983 Spring ring .02 84984 Case assembly (less covers) 3.50 84987 Speaker grille cloth .12 84990 Single hole mounting plate .80 84991 Bottom cover 1.00 84992 Top cover 1.00 85012 Mounting bolt .06 85026 Dash support washer .05 15214 Long mtg. strap screw No. 10-32x11/4" $0.01 81214 Flexible casing set screw .02 83919 Bezel and glass assembly .50 83920 Pilot light button assembly .25 84067 Steering column mtg. bracket .25 84484 Knob (volume and tuning) .14 85000 Remote control head (less shafts) 6.00 85011 Complete accessories for installation 5.00 85016 Dial face .25

Part No.

FLEXIBLE SHAFTS

DESCRII'TIO:V List

Price 2.00 1.25 84996

84998 Tuning shaft, 24 inches long Volume control shaft, 24 inches long

$1.50 1.50

85104 Tuning shaft, 36 inches long 2.00 85105 Volume control shaft, 36 inches long 2.00 85107 Tuning shaft, 30 inches long 2.00 85108 Volume control shaft, 30 inches long 2.00

©John F. Rider


FIRESTONE PAGE 16-7

THE FIRESTONE TIRE & RUBBER CO. MODEL 7383-4

POWER SUPPLY PROTECTIVE RESISTOR The filter system and the rectifier tube are pro- tected against breakdown during the warming - up period by the Globar resistor (No. 15 in the circuit diagram) which is connected across the high voltage secondary of the power transformer. This resistor drops rapidly in resistance as the voltage across it rises, so that it acts as a load on the power transformer during the warm-up period and keeps the voltage below the danger point until the tubes are heated and take their normal current. Because of its unique voltage characteristics, the Globar resistor cannot be tested with an ordinary ohm- meter, since it will show a resistance of several megohms.

CALIBRATION AND ALIGNMENT A good modulated oscillator and a sensitive output meter are necessary for the proper calibration and alignment of this receiver. The output of the oscillator must be adjustable to give a very weak signal which will not actuate the A.V.C. of the receiver. The output meter must be sensitive enough to give sufficient reading with such a weak signal. The output meter should be connected from the 41 plate to ground through a .25 mfd. condenser or across the voice coil, depending upon its sensitivity. A convenient point at which to connect to the 41 plate is the yellow lead terminal on the speaker terminal strip. During all calibration and alignment adjustments. keep the volume control full on.

I. F. ALIGNMENT The I.F. trimmers are located on the top of the I.F. transformers and may be reached by removing the top cover. The modulated oscillator should be set to exactly 456 K.C. and connected from the 6A7 control grid to ground. Adjust the oscillator output to give about half -scale reading of the output meter. Tune the set to make certain that no station or signal is tuned in since this would affect the output meter reading. Adjust all four I.F. trimmers to give maximum output reading. In adjusting the I.F. transformer trimmers, it is desirable to use a bakelite screw driver or one having only a small metal tip. After the I.F. trimmers have been aligned once, go back and repeat the procedure, since any adjustment of one will affect the others to some extent.

R. F. ALIGNMENT With the test oscillator set to approximately 1400 KC., tune the set very carefully for maximum output.

Adjust the output of the test oscillator to the minimum value which will give sufficient output meter deflection. Adjust the trimmer nearest to the shaft end of the gang condenser to give maximum output meter reading.

DIAL CALIBRATION The dial of the Auto Radio is calibrated in kiló- cycles except that the last two zeros have been omitted. Inasmuch as changes in the positibn of the flexible shafts may cause the calibration to vary, the set should be calibrated when the arrangement of the shafts has been completed. Calibration ire accomplished as follows: Tune in a station of known frequency between 800 and 1100 KC. Insert a screw driver in the slotted end of the dial shaft projecting through the back of the control head. Hold the tuning control knob so that the station remains tuned in properly and by turning the screw driver adjust the dial pointer so that it indicates the exact station frequency. If the set is badly out of calibration, such that It calibrates correctly at one part of the dial but not at another, it is necessary to adjust the oscillator shunt trimmer as explained below. In order to reach this trimmer the chassis will have to be removed from the case as follows. (1) Remove the flexible shafts and dismount

the receiver. (2) Remove the four terminals of the speaker

cable from the speaker. (3) Remove the black antenna lead from the

coil and unsolder the coil shield grounding braid.

(4) Remove the blue dial light lead from the socket terminal.

(5) Remove the yellow tone control lead from the tone control switch.

(6) Remove the six slotted chassis fastening screws and slide the chassis out of the case.

Connect a .00025 mfd. condenser in series with the output lead of the test oscillator and the antenna lead lug on the antenna coil and connect the ground lead of the test oscillator to the chassis. Set the test oscillator to exactly 600 KC. Tune the radio set to maximum volume and set the dial to read exactly 6.0 (600 KC.). Then set the test oscillator to exactly 1400 KC. Turn the tuning knob until the dial pointer indicates 14.0 (1400 KC.). Adjust the oscillator shunt trimmer (on the gang condenser second from the control end) until the meter indicates maximum output. Then adjust the other gang condenser trimmer as directed under the R.F. alignment.

©John F. Rider


8 FIRESTONE MODEL 7402--6- MODEL 7383-4

Illus. Part No. No. Part Name Description

1 11824 Cable Battery with four prong plug $0.35

2 10832 Choke Filter .85 3 10768 Coil 1st I.F. Transformer 1.05 4 10769 Coil 2nd I.F. Transformer 1.10

5 11830 Loop Antenna Assembly complete with frame ... 1.75

6 11813 Coil Oscillator .65

7 11814 Condenser .. Tuning Two Gang 1.65 8 11822 Condenser .. Tubular Dry Electrolytic

(40-40) Mfd. 150 Volt & 20 Mfd. 25 -Volt)

9 9981 Condenser .. Tubular .2 Mfd. 200 Volt 10 1151 Condenser .. Tubular .1 Mfd. 200 Volt 11 1151 Condenser .. Tubular .1 Mfd. 200 Volt 12 1147 Condenser .. Tubular .06 Mfd. 200 Volt 13 1147 Condenser .. Tubular .05 Mfd. 200 Volt 14 1147 Condenser .. Tubular .05 Mfd. 200 Volt 16 1368 Condenser .. Tubular .003 Mfd. 400 Volt 16 1368 Condenser .. Tubular .003 Mfd. 400 Volt 17 10762 Condenser .. Tubular .002 Mfd. 400 Volt 18 9457 Condenser .. Tubular .05 Mfd. 400 Volt 19 9458 Condenser .. Mica .00025 Mfd. 20 9458 Condenser .. Mica .00025 Mfd. 21 7934 Condenser .. Mica .0001 Mfd. 22 2705 Resistor .... Carbon 2 Megohm 3 Watt 23 7998 Resistor .... Carbon 1 Megohm ais Watt 24 2673 Resistor .... Carbon 750,000 Ohm 3 Watt 25 6984 Resistor .... Carbon 500,000 Ohm % Watt 26 3534 Resistor .... Carbon 75,000 Ohm lis Watt 27 9693 Resistor .... Carbon 5,000 Ohm 3iá Watt 28 6875 Resistor .... Carbon 260 Ohm 3 Watt

THE FIRESTONE TIRE

MODEL 7402-6

1.16 .29 .20 .20 .19 .19 .19 .17 .17 .19 .18 .21 .21 .21 .19 .19 .19 .19 .19 .19 .19

& RUBBER CO.

List Illus. Part Price No. No. Part Name Description

List Price

29 9018 Resistor ....Carbon 150 Ohm ifs Watt $0.19 30 1408 Resistor .... Wire Wound, Flexible 25

Ohm 11 Watt .19 31 10858 Resistor .... Wire Wound, Flexible 200

Ohm 2 Watt .22 32 11823 Resistor .... Wire Wound 1700 and

20 Ohm .45 33 11825 Resistor .... Line Cord .90 34 11821 Speaker .... P.M. Dynamic 5" 4.00 35 11815 Switch Voltage Selector .90 36 11112 Vol. Control. With D.P.S.T. Switch .90

MISCELLANEOUS PARTS

11304 Bulb 6-8 Volt .150 Amp. Type No. 47 $0.10

Scale Calibrated Scale .40 Cord 9" of 18 Lb. Drive, Cord .10 Pointer For Dial .15 Shaft Drive Shaft .15 Shaft "C"

11816 Dial 8184 Dial

10679 Dial 11084 Dial 8117 Dial

Washer 11818 Dial 11819 Dial

Retainer Washer Crystal For Dial Plate Metal Front Plate over

Dial 10884 Indicator Plate ... Marked "AC-DC"-

"OFF"-"BATT" .. 10787 Knob For Tuning and Volume

Controls 10907 Knob For Voltage Selector

Control 10850 Plug 4 Prong for Battery ...

35Z46T

SECT.

35u61.

POWER

EXT. ANT.

115 V.

LINE

POWER

2nd I.F. TRIMMERS 455 KC_

CASE COVER LOOP ASSEMBLY (INSIDE VIEW)

(S)

WHITE -GREEN

17'0 KC. OSC. TRIMA ER

NOTE A: The actual bias on the grid of the 41 tube

is -23 volts which must be measured from chassis to

the ungrounded filter choke terminal. Due to the high

resistance of the grid leak, the voltmeter will show

only about -1 volt at the grid.

EXT GND

GREEN DO

WHITE -BLACK

1400 KC ANT. TRIMMER

K

AMRCVIATIONS s. 01001 . MID M NEATER K CATMOIE P PLATO

MO0. 100.110 ONO 10.PNE1WR 00.10

.02

.25

.40

.10

.08

.10

.10

VOLTAGES MEASURED, BETWEEN SOCKET

TERMINALS AND CHASSI S

BATTERY VOLTAGE 6.0

BOTTOM VIEW OF CHASSIS

MODEL 7383-4

11V1POÌt1A2N 1': Use nigh resistance voltmeter of 1000

ohms per volt. Readings will vary depending upon

range of meter. Make allowance for battery voltage

variations. NOTEB: The oscillator grid voltage varies from about

-3 at 1500 KC. to -5.0 at 530 KC. The oscillator anode.

voltage may vary from 115 at 1600 KC. to 120 at 53KC.

©John F. Rider


FIRESTONE PAGE 16-9

MODEL 7396-1 THE FIRESTONE TIRE & RUBBER CO. MODEL 4-A-17

6D6 R. r.

4

x

77 I+11 DET6 OSC.

x

6D6 I. r.

6

A

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sid

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12

4 5 A

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4

24

41 OUTPUT

4

12

20

FILAMENTS CONNECTED

7S To x

NOT.-.L DDDDO - .- SATTER," so - 1

CONNECTION 44

46

r PLUG

A

13

16

'00000 19

f

CLUE o

Joe oe- ' 4

47T I I

R -2_45-A SiKh.

I. F. FREQUENCY 177.5 KC. MODEL 7396-1

APPROXIMATE STAGE GAIN MODEL 4-A-17

Be sure R.F. and I.F. stages are accurately aligned before measuring gain. R.F. gains can be measured with a "channel" type ins rument containing a tuned and calibrated R.F. amplifier. A vacuum tube voltmeter may be used for audio gain measurements. GI.serve following precautions:

1. For all gain measurements connect signal generator as shown. Use 1000 KC signal with 400 cycle modulation (usé nearby frequency if local station interferes).

2. Be sure radio is carefully tuned to generator signal. (Use weak signal for sharp tuning.)

3. When using a "channel" type instrument, carefully tune it for maximum output at desired frequency before making measurements.

Differences in tube characteristics, tolerance of parts, adjustment of tuned circuits, and variations of line voltage will influence stage gain. Accuracy of measurements is dependent upon careful tuning of receiver to generator signal and experience in using your test equipment. These factors may create considerable variation in gain measurements.

DIAL AND POINTER DRIVE CABLE ARRANGEMENT

To string dial cable, set gang condenser to fully meshed position, using the following parts:

A-51726-1 Spring, cable

B-55402-1 Cable assembly

©John F. Rider


10 FIRESTONE

MODEL 7396-1 THE FIRESTONE TIRE & RUBBER CO.

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©John F. Rider


FIRESTONE PAGE 16-11

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©John F. Rider


1Z FIRESTONE MODEL 7402-6, RoamerTHE

FIRESTONE TIRE & RUBBER CO.

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©John F. Rider For sockets and trimmers, see F.16-8


FIRESTONE PAGE 15-13

THE FIRESTONE TIRE & RUBBER MODEL í 402-6, Kramer.

Be sure to follow procedure carefully and in the order given-otherwise the receiver will be in- sensitive and the dial calibration incorrect. For alignment procedure read tabulations from left to right. If more than one adjustment is required on any one band; make the adjustment marked (1) first, (2) next, (3) third. Before starting alignment, check tuning dial adjustment by: turn gang condenser until plates touch maximum capacity stop (completely in mesh) at which point the dial indicator must be exactly even with the last line at the low frequency end of the dial calibration. If dial needle does not point exactly to last line move needle to correct position. Use an accurately calibrated test oscillator with some type df output measuring device. BEFORE ALIGNING, PLACE LOOP AN-

TENNA AND THE BATTERY IN THE SAME APPROXIMATE POSITION IN THE BACK OF CHASSIS THAT THEY WILL BE IN WHEN THE SET IS IN THE CABINET AND THE CABINET BACK CLOSED.

When adjusting 1730 kilocycle oscillator trimmer and 1400 kilocycle antenna trimmer, do not connect test oscillator to terminals on bottom of cabinet back.

Couple test oscillator to receiver loop by: (a) Make a loop consisting of five to ten turns

of No. 20 to 30 size wire wound on a three- inch form and attach across output of test oscillator.

(b) Place test oscillator loop near set loop-BE SURE THAT NEITHER MOVES WHILE ALIGNING.

Set receiver dial to:

TEST OSCILLATOR

parts layout dia Refer togram for location of trimmers mentioned below-and:

Adjust test oscillator

frequency to:

Use dummy antenna in series with output of

test oscillator consisting of:

Attach output of test

oscillator to:

(1) Exactly 1730 K.C.

Exactly 1730 K. C. None

Use small loop to couple test oscillator to

receiver loop

Adjust 1730 K. C. oscillator trimmer for maximum output.

(2) Approx. 1400 K. C.

Exactly 1400 K. C. None

Use small loop to couple test oscillator to

receiver loop

Adjust 1400 K. C. antenna trimmer for maximum output.

I. F. Any point where no

interfering signal is received

455 K. C. .02 MFD condenser

High side to grid terminal of 1A7G tube Low side to

chassis DO NOT REMOVE

CAP.

Adjust each of the second I. F. transformer trimmers for max - imum output-then adjust each of the first I. F. trimmers for

maximum output.

SHOULD THE RECEIVER FAIL TO OPER- ATE CHECK FOR : 1. Weak battery. 2. A defective tube. 3. Tubes not properly inserted in tube sockets. 4. Grid caps not properly inserted on grid ter-

minals on top of tubes. 5. Set may not be in correct position-rotate

radio to point of greatest volume. 6. If set is being operated in an isolated dis-

trict, an external aerial may be required. A NOTICEABLE REDUCTION IN RECEIVER VOLUME, assuming that all tubes are in good condition, can generally be attributed to a low battery that should be replaced.

s

0

FRONT OF CHASSIS%

SYM DESCRIPTION NOTE: ALL VOLTAGES EXCEPT FILAMENTS ANO HEATERS MEASURED FROM SOCKET TERMINALS TO GROUND WITH A 1000 OHM PER VOLT VOLT.

FILAMENT HEATER

P PLATE 103

METER FILAMENTS AND HEATERS MEASURED DIRECTLY ACROSS SOCKET TERMINALS.

DP ODE PLATE G NTROL GRID G. OSO, GRID

625 G. OSC. PLATE 6 V. 'A' OAT. DRAIN- SO NA. 90 V. '6 OAT. DRAIN - 9 MA.

* AC EXCEPT WHEN USED ON OC.

SCREEN CATHODE

NC NO CONNECTION

I.] 14

25

I.S

75

90

()John F. Rider


14 FIRESTONE

MODEL 7403-1, Brilliantone


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