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DELCO RADIO PAGE 4-1

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2 DELCO RADIO

LIODEL 3026

Chassis Layout

Below Serial 1400

DELCO RADIO CORP.

cil

BOTTOM OF CHASSIS For sets with serial numbers below 1400



DELCO RADIO CORP. MODEL 3026 Above serial 1400 Chassis layout

ri .14nle_nra Coi

Bottom of Chassis For Sets with.Serial Numbers tibove 1400


..s.(:E 4-4 DELCO K.AI)IO

vTODEL 3026

Socket layout Cable data

CABLE COLOR CODE:

Color

DELCO RADIO CORP.

BATTERY CABLE

Battery end

Terminal No. (Plug on Receiver Cass)

Red B t 180V. 8

Maroon B+ 67i V. 8

Yellow B- 12 Black -Yellow A (hot side) 11

Black A (ground side) 2

CONTROL UNIT CABLE FROM TrRNINAI. NO. TO TERMINAL NO. CONNECTS

COLOR _(Control Unit Term. Strip) (Plug on Rec. Case)

Black -Yellow 1 11 A (hot side) to switch

Black 2 3 Switch to filament

Green 3 12 B- from Battery Red 4 1 A.V.C. cathode to high re-

sistance side of Vol. Control.

Maroon 5 9 Grid resistor of A.V.C. tube

to center tap of Vol. Control.

Yellow 8 5 B- to low resistance side of

Vol. Control and to the switch

SPEAKER CABLE FROM TERtM.INaL N0. TO TERMINAL NO. CONNECTS

COLOR (Sper. Terra. $trig) (Plug on Rec. Case)

Black -Yellow 1

Black 2

Yellow 3

Red 4

Maroon 5

4

2

7

8

10

One side of speaker field thru

fuse to hot side of "A" Battery

Other side of speaker field to

ground side of "A" Battery

Yellow lead of output trans. to

plate of one 247 tube.

Red lead of output trans. (cen-

ter tap) to4-180 "B^ Battery.

Blue lead of output trans to

plate of the other 247 tube.


DELCO RAI)1O PAGE 1-5

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MODEL 3026 DELCO RADIO CORP. Terminal data

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DELCO RADIO CORP. MODEL 3026 Voltage, Resistance Plug data

Type Position Control Screen Pentode Normal of of Fil. Plate Grid Grid Cathode Screen Plate Grid

Tube Tube Volts Volts Volts Volts Volts Volts Current Test

37 Oscillator 5.5 65 -;-- 5.0 36 R. F. 5.5 105 .15 65 55.0 36 1st Detector 5.5 165 5.50 80 5.0 36 I. F. 5.5 110 2.50 75 52.0 37 A.V.C. 5.5 15 7.5 37 2nd Detector 5.5 150 10.00 5.0 47* A.F. 2.5 150 18.00 47* A.F. 2.5 150 18.00 ---- ---- GA# A.F. 5.0 150 18.00

160 160 160

6.0 7.5 2.5 3.5 1.3 2.5 .5 3.0

7.0 25.0 7.0 25.0 7.0 25.0

Volume Control on Max. "B" Battery Voltage 180

*Do not attempt to take readings on the type 47 (Pentode) tube unless your set analyzer is equipped to test sets using this type of tube. Otherwise, readings taken at the 47 sockets will be misleading.

,AGA pentode used in Models 2027-A and 2029-A in place of '47 pentode output tubes.

NOTE: It should be noted that readings obtained with different set analyzers will vary with battery voltage and with different tubes. The readings shown, therefore, are only average readings. For this reason, each service man should compile a chart similar to the one illustrated, using his own set analyzer with a set, and batteries that are known to be operating properly.

Test from to Correct Probable cause of trouble

contact contact Voltage if voltage is below Min. No. No. Readings Limit

Min. Max. 5 8 120 180 5 E 45 675

1 8 120 180 9 8 120 180 5 7 120 160 5 10 120 160 2 3 6.0 6.8

3 4 6.0 5.b

8 2 No Reading 6 2 No Reading-

Guide Pin

Sets with serial numbers Below 1400 -

View of plug in case with chassis remòvedi

Low "B" Batteries Low "B" Batteries Open volume control Defective volume control

Open speaker transformer O'Den speaker transformer Locc storage battery Open sneaker field (If reading is obtained "B"

Batteries may be Grounded or "B" Battery wires may be

grounded due to moisture be- tveen the Batteries and "B" Battery box.)

coo ol

©0 ^^

E---- Ce

Guide Pin

Sets with serial numbers Above 1400


8 DELCO RADIO

MODEL 3026 Values, Changes

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DELCO RADIO CORP.

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DEWALD PAGE 4-1

DEWALD RADIO MODEL 41 Schematic

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I)EWALD PAGE 4-3

DEWALD RADIO MODEL 52 Schematic

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DEWALD PAGE 4-5


6 DEWALD


DEWALD PAGE 4 7

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DEWALD PAGE 4 9

DEWALD RADIO MODEL 61 Socket layout Alignment

RECEIVER To align the I.F. circuit, an oscillator sup - ALIGNMENT plying 456 K.C. should be connected to the

control grid of the 6A7 and the variable condenser frame. The grid cap normally on the 6A7 should be removed. The oscillator section of the variable condenser should be short circuited. This may be done by putting a small clip on the terminal of the oscillator condenser trimmer and running a wire to ground. It is preferable to use an output meter for accurate work, which may be connected into circuit of the 41 by means of an adapter having leads brought out from plate and screen through a .5 mfd stopping condenser. See Fig. ih4.

The volume control on the receiver should be turned to maximum and the three I.F. adjusting screws shown in Fig. #2 set to give maximum on the output meter. This operation may be performed with the receiver in the can if a pair of long nose pliers or offset screw driver is used,

For R.F. alignment, remove oscillator condenser short circuit, replace grid cap on 6A7 and connect oscillator covering broadcast range to antenna wire and its shield.

Fig. 2

37 First Audio Tube

85 Diode Detector

41 power Tube

Battery Cable Screws

'folding Eliminator

Vibrator

'78 I.F. Amplifier

Antenna Coil

Oscillator Section Í

R. F. Section

i

i 01 Antenna Cable Shield Grounded To Car

Case

t,

Second I.F. Adjusting Screw

Spring Grounding Vibrator Gase

84. Rectifier for `"B" Supply

Two I.F. Adjusting Screws

Screws Holding Eliminator

\6A7 Oscillator Detector


PAGE .1-10 DEWALD

MODEL 61 Notes

DEWALD RADIO

Be sure shield of battery cable is soldered to can at left side of receiver,

When cover is placed on can, a heavy spring on the inside grounds the top of ''B" supply unit. Be sure contacts is good and pressure heavy.

Condenser from antenna transformer should run to front of variable condenser. If further difficulty is experienced check ground of chassis and "B" supply unit to can at various points with heavy screw driver.

The wire on vibrator which runs from its coil to the frame, should be securely soldered on frame and on inside of vibrator case.

POSSIBLE A, Low volume or weak signals SET TROUBLES 1. Defective tubes.

2. Poor antenna (small size shielded wire must not be used to extend present antenna, as capacity between shield and inside is too great.

3. Open circuit in radio frequency or audio stage.

4. Defective resistors. 5. Defective by pass condensers. 6, Defective volume control 7. Low . "B'; voltage.

B. Intermittent reception. 1. Antenna shorting (usehigh resistance continuity

to check car antenna -set disconnected) 2. Defective tubes. 3. Loose connection. 4. Film breaking down in electrolytic condenser 5. Defective speaker 6, Defective volume control 7. Defective by pass condenser

,Fig.3b .2> -B Plus Red Lead

O -Hot "A" Black Le :d

Ground ,Yellow Lead

View Showing Eliminator Three TeFminals & Color Code of Connections

Adapter for 41 Showing Wires to Screen Grid & Plate Plue Circuit

o Q

0 Fig. 4

Screen

Prongs Pointing Downward

Output Meter

.5 Mfd. 200 V. Condenser


DEWALD PAGE 4-11

DEWALD RADIO MODEL 61 Vibrator data

VIBRATOR To examine vibrator, remove "B" supply unit ADJUSTMENT from can by unsoldering 3 leads

(see Fig.3) removing 6 screws at ends of unit Take cover off vibrator case and vibrator may be removed without unsoldering its lead? wires. It will be seen that there are a top and a bottom set of contacts. The normal clearance on these contacts is .003" to .004" and this may be adjusted with screws provided.

Any dirt on contacts should be removed with pipe cleaner before adjustment. If top clearance is too great vibrator may operate but not close this circuit (operate half wave) and the voltage will be low. If bottom clearance is too great, vibrator will pull down but not vibrate. Tao small a bottom clearance may short bottom contacts and cause in. operative vibrator and heavy current drain.

If both contact clearances are small, the vip brator will operate at a higher pitch and voltage, but sparking will occur.

Check of vibrator operation may be made by running three temporary jumpers from "B" supply unit outside can to the receiver, (See Fig.3) and operating the vibrator outside its case so it is visible. The tone should be low pitched, even and regular, and no appreciable sparking should occur. To remove vibrator for replacement purposes, unsolder the three vibrator wires at the terminals of the step up transformer and at the ground terminal near the tube. Leads should be left attached to vibrator.

If set is not available or is in doubtful con dition a 4000 ohm load resistance of 5 watts or larger may be used from plus ''B" to ground of eliminator in place of set, The 6 -volt supply is applied to the two terminals at the vibrator end of "B" unit.

If gaps are okay, and sparking persists, check for dirty contacts or open condenser across primary of step»up transformer, Vibrator Base is Grounded

( to Vibrator Case Vibrator

Cover is Held By Two ';nd Screw


12 DEWALD

}i)DEL 61

Parts List Alignment

DEWALD RADIO

Set test oscillator at 1500 K.C. and receiver

variable condenser at minimum capacity. Adjust to maximum

output with trimmers on top of variable condenser.

Apply 600 K.C. from test oscillator, tune in

on receiver and check variable condenser alignment by bend-

ing one R.F. condenser rotor plate in or out slightly to

give maximum output. Repeat procedure at 800, 1000, and

1200 kilocycles.

MODEL #61 RECEIVER

NUMBERS AND LIST PR ICES OF REPLACEMENT PARTS

1165 Second Detector Transformer trig,. $ 1.40

1166 Dual I.F. Tuned Transformer 1168 Oscillator Coil 1.70 70

1169 Antenna Coil .85

2033 25 Cub Condenser .35

2046 05 Cub Condenser .35

2047 00025 Mica Condenser 35 2056 01 Cub Condenser .35

2081 00015 Mica Condenser .35

2123 0001 Mica Condenser 2133. 5 Mfd Elect. Condenser .75.35

2135 2 X .05 Cub Condenser ' .. .45

2147 8 Mfd Elec. Condenser .................. 1.00

2152 25 Gen. Condenser .50

3192 Spark Plug Suppressor .50

3193 Distributor Suppressor .5a

5064 Antenna Cable .50

5069 Battery Cable .90

7095 Speaker, 5.20

8308 Combination Controls (Vol Cont. & Switch) 1.15

9257 Drive Cover .50

9270 Baffle'Board . .15

MODEL #61 ELIMINATOR

1163 Choke R.F .60

1162 Transformer *quit 2.50 2070 .5 Mfd Cub Condenser................... .35

2033. .25 Cub Condenser .35

2145 .025 Mfd Cub Condenser .. .35

2147 8 Mfd Elect. Condenser..... 1.00

8304 Vibrator 5.00

9289 T. & B. Cushion 3/8 X-2-1/16 X 4-3/8.... .25

9290 Side Cushion 3/8 X 1-/16 X 3-5J8....,. .20

9291 End Cushion 3/8 X 1-3 16 X 2-1 16...... .20

1161 Filter Choke .75

9202-9203.. Drive Cable Ably 1,75

8317...... Driven Gear Ably 1.00


DEWALD PAGE 4-13

DEWALD RADIO

4

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EDISON PAGE 4-1

MODEL "Light-O-Matio" THOMAS A. EDISON, INC. Cable drive data

1. DRIVE MECHANISM. Twenty pound test line is specified and used for driving the dial mechanism. Each end of the belt is secured to the large pulley wheel. The ends pass through holes on opposite sides of this pulley and are held by knots tied in the belt itself. The belt pasees over two smaller pulleys in a spring -actuated take-up assembly, thence to a worm rnhich slips over the tuning knob shaft.- Five turns are made by the belt around this worm. The worm is not directly secured to the tuning knob shaft but is held in position between two collars locked to the shaft. A spring washer is inserted between the worm and the front collar. The spring washer being adjusted so as to provide friction to a sufficient degree, exceeding the driving resistance of the dial mechanism itself and its associated condensers; yet insufficient friction to resist continued rotation of the tuning knob when the dial mechanism has been rotated to either extreme end, thus preventing slippage or breakage of the belt after proper adjustment has once been made.

2. SPRING -WASHER. Receiver units bearing serial numbers ranging above 725000 have been equipped with a spring washer of improved design, greatly diminishing the possibility of dial slippage. The improved washer may be distinguished from the earlier style washer by its cup -shaped appearance, much of which it retains even when adjusted to ff position for maximum friction.

3. DIAL SLIPS OR STICKS. Sticking or slipping of the dial may result if the spring washer is not adjusted for sufficient friction against the drive worm or if the belt is

too loose.

4. ADJUSTMENT OF SPRING WASHER FOR INCREASED FRICTION. Note Figure 12. Observe the r-elr.tive positions of front collar, spring washer, drive worm, rear collar and bearing plate "B".

NOTE: IP dial slips and continues to

slip after collar has been for-

ced forward for maximum friction of spring washer against worn, then inspect "take-up

assembly. If distance "x" is

less than 1 -16th inch, belt

should be tightened in accordance with instructions.


2 EDISON

MODEL "Light -O -Matie" Cable drive data THOMAS A. EDISON, INC.

Rotate dial to approximate position as shown in Figure No. 12 so

that these parts are most readily accessible with long blade

screw driver. Loosen both set screws in rear collar. Insert

screw driver blade between rear collar and bearing bracket,

indicated by "Z". Force the rear collar forward, in the direction

of the tuning knob, by twisting the blade or prying against the

bearing bracket. This action compresses the spring washer

between the worm and front collar, providing greater friction. Then, with a narrow blade screw driver, tighten set screws in

rear collar, making sure that rear collar does not shift before

the second set screw is tightened. This operation properly performed will eliminate slippage of the worm.

5. OIL should not be applied to the spring washer or worm. The application or presence of oil on these parts promotes slipping and will defeat proper functioning.

6. TO TIGHTEN BELT. Although not absolutely necessary greater accessibility may be had by removal of the front panel.

Then remove the right hand variable condenser shield. Loosen the two set screws in dial mechanism that hold the shaft of the right hand variable condenser, and then push the rotor plate assemblies into position of maximum capacity so that the possibility of damage to them is reduced to a. minimum. Consult Figure No. 13. Rotate the tuning knob until the large pulley with the knot "K" is in the approximate relative position short in Figure No. 13. Insert screw driver blade as shown between chassis shelf and take-up assembly bracket. Lift upward on this screw driver, compressing take-up assembly spring "S", and loosening belt "i

, Block screw driver blade as illustrated at point "X", thus maintaining looseness of belt. Then pull knot "K", taking up slack in belt:"?".: Then tie a new knot in this belt as near as possible to the pulley face. It is

usually advisable, if possible, to untie the original knot to avoid its rubbing against the condenser shield.. When the new knot has been formed, remove the screw driver, rotate the tuning knob in a counter clockwise direction (to the left), turning it

as far as possible. Then tighten the set screws that hold the dial mechanism to the shaft of the right hand variable condenser. Replace the right hand condenser shield, front panel and knobs.

7. NOTE. It is always advisable, after removal or replacement of panel or when any adjustment of the variable condensers is made, to reneutralize and then recompensate to insure most accurate calibration. These operations are explained in detail in bulletins numbered 3 and 4.


EDISON PAGE 4 3

MODEL "Light-0-Mation

THOMAS A. EDJSON, INC. Cable drive data

1. A cup -shaped friction rasher is nor being used Light-O-Matic Models to prevent slipping of the belt drivin-.. wol .

2. It is recommended that this cun-shaped friction rasher be installed in addition to the regular friction rasher wherever the worn has a tendency to slip. This is done in the following manner.

3. Remove left hand gang condenser shield housing.

Loosen both set screws in clutch collars "'A" and See Figure L?o. 9.)

5. Pull out tuning knob shaft slowly about z inch or ntil collar "A" can be removed, taking care to hold shaft straight

so drive cord rill not change its position on worm.

6. Push tuning shaft back in slightly and place cup- shaned rasher on end of this shaft.

7. Replace collar "A" in position and push tuning knob shaft through into its original position.

8. Tighten both set screws in collar "B".

9. Insert a screw driver between collar "A" and frame earing at point "C".

10. Twist screw driver, forcing collar "A" toward panel thereby compressing friction washer, and while holding it in this osition, tighten one set screw.

11. If friction clutch does not slip, tighten the other set screw in collar "A".

Point "C" Insert Screw Driver

INSTALLATION OF NEW CUP -SHAPED FRICTION WASHER

"_ir.

12. If clutch still slips, loosen set -screw in collar "A", reinsert screw- driver at point "C" and exert greater twisting force before tightening set -screw.

13. If the clutch does not slip, tighten the other set -screw in collar "A" and replace gang condenser shield housing.

Collar "B"

Friction Washer

Insert Cu. Washer Here


4 EDISON


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4 AUTOLITE

MODEL 072-A Installation notes

ELECTRIC AUTO LITE CO.

The chassis is received with the condenser pulley, spring and centering ring mounted in the proper position on the tuning condensar and the cable chuck through which the drive cable passes mounted on the chassis box.

All that it is necessary tó do is to mount the control unit on the steering column, cut the cable and housing to length if necessary, attach the cable to the

drive pulley, and secure the housing in the chuck.

MOUNTING THE CONTROL UNIT

The control unit is mounted on the steering column with the knobs extending to-

ward the right hand side. The proper distance below the steering wheel can be

determined by trial.

Two clamps are provided to secure the control unit to the steering column. Use

the lockwashers supplied under the heads of the clamp screws to secure the clamps

on the control unit.

If the steering column is l` in diameter, use the leather spacers supplied. If

1-5/8", split the spacers or wrap the column with about 1/16" of friction tape

under the brackets. If the column is l-3/4", no spacers are required.

ATTACHING THE CABLE

The drive cable should be tun in as straight a line as possible. Avoid any sharp

bends.

After the control unit has been mounted and before securing the drive cable and

housing at the chassis, cut it to length if necessary. Be sure that enough cable

is allowed to avoid any sharp bends. Do not coil the excess length in short loops.

To cut the cable proceed as follows: With a sharp three -corner file, file across

one of the turna of the tubular housing until it is practically severed. Then

bend it only slightly back and forth until it breaks off. Do not bend sharply

as in so doing permanent injury to the inner element of the cable might result.

Turn the station selector knob on the control unit as far as it will go in a

counter -clockwise direction. The cable will then extend out of the housing the

greatest distance.

Loosen the large jam nut on the cable chunk. Insert the free end of the cable

and its tubular housing. Be sure that the housing with its weatherproof cover-

ing is inside the chuck. Then tighten the jam nut. This will secure the hous-

ing and weatherproof braid in place. As explained above, the station selector

knob should be turned to the extreme counter -clockwise position. The rotor of

the tuning condenser ig held at the extreme clockwise position by the action of

the spring. Bring the free end of the cable around the pulley, loosen the cable

clamp screw at the top of the pulley, insert the cable under the clamp washer

and than tighten in place. Cut off any excess cable to prevent tangling with

other parts of the receiver. Care should be taken not to put a sharp bend in

the exposed portion of the drive cable, as the latter may be permanently injured.

After the cable head is in place on the chassis. and after the drive cable is at-

tached to the pulley, chock the centering of the cable, chuck with the pulley. If

necessary to re -center, loosen the nut which secures the chuck to the chassis box.

Then move the chuck until the cable is centered relative to the groove in the

pulley and re -tighten the nut.

PIAL LAMP

The dial lamp may be replaced by removing the station selector knob and the two

screws on the sides of the control housing, Use a standard 6-8 V. screw base lamp

which may be procured from the factory. As a temporary measure, a 6 volt pilot

light bulb may be procured from any radio store.


ELECTRONIC LAB. PAGE 4-1

MODEL "Electronics B

ELECTRONIC LABORATORIES, INC. Scheuratio, Notes

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ELECTRONIC LAB. PAGE 1-:

ELECTRONIC LABORATORIES, INC.

ENGINEERING SPECIFICATIONS 1

PART NO.

MODEL 338,339 DC Converters

Schematic

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78-Detector Oscillator 98

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EMERSON PAGE 4-3

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EMERSON PAGE 4-5

1VDEL, 33 LOT, 30 IN, EMERSON RADIO AND PHONOGRAPH 250 IN, 321 LW,

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Either A. C. or D. C. - - 110-120 Volts - - 25 to 60 Cycles

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Voltage Readings:

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Tuning control set for 550 K.C., and antenna outside the set.

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EMERSON PAGE 4-9

T.UDELS 415,416 EMERSON RADIO AND PHONOGRAPH Schematic

CORPORATION Layout Voltage

Universal Compact Operates en either AC or DC

I10-120 Volts, 25-60 Cycles

Adaptable for 220 -Volt Current

with use of 220 -Volt Resistor

Voltage Readings: Readings should be taken with Volume Control fully on, Tuning

Control set for 550 KC., and antenna outside of set. Use a D. C. voltmeter having a resistance of 1000 ohms per volt.

Chassis To- Plate Screen Cathode

77-Detector 10- 15 9- 12 1- 2

78-RF. Amplifier 105-115 105-115 2- 3

38-Output Pentode 105-115 105-115 - Voltage across filter choke is "C" bias for 38 Tube 10v.

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.5 MEG.

05 ALI


¡I AGE I-10 EMERSON

MODEL 420 (V-4) Schematic, Voltage Socket layout,Notee


Voltage Readings: Readings should be taken with Volume Control fully on, Tuning

Control set for 550 KC., and antenna outside of set. Use a D. C. voltmeter having a resistance of 1000 ohms per volt.

Chassis To- Plate Screen Cathode

77-Detector 10- 15 9- 12 1- 2

78-R.F. Amplifier 105-115 105-115 2- 3

38-Output Pentode 105-115 105-115

Voltage across filter choke is "C" bias for 38 Tube=lOv. Readings will not change materially regardless of type of power

supply.

For Automobiles, Motorboats and Homes Not Wired for Electricity-Farms, etc.

Directions for 6 -Volt (Automobiles, Motorboats, etc.)

Attachment required: 1 -EMERSON 6 -volt Type "B" Eliminator.

Remove the Antenna from its compartment and place as indicated for homes or, in the case of automobiles, connect to the automobile antenna system.

Remove the regular power cord and plug from the set.

Attach the 7 -prong socket on the eliminator cable to the 7 -prong plug in rear of the set. Attach the 2 -conductor cable from the eliminator to the 6 -volt battery.

Where 12 -Volt "A" Battery is used in automobile, care should be exercised that cable is so connected that only 6 Volts is applied to the set.

Directions for 32 -Volt Farm Lighting Systems-The only additional equipment required is one EMERSON 32 -volt type "B" Eliminator. The regular Power Cord and plug are not used and should be removed.

Attach the 7 -prong socket on the eliminator cable to the plug in the rear of set. Connect the 2 -prong plug to the 32 -volt light socket and the set is ready for operation.

Directions for 220 Volt AC-DC-The 220 -volt Ballast Adapter is required. Insert the 220 -volt Ballast Adapter in the 220 -volt supply and insert the two -prong set plug into the adapter socket; then follow instructions for operation for home use.

For List of Parts, see Index

Model V4 For EITHER AC or DC -25 to 70 Cycles

100 to 135 Volts-Also 6 Volts, 32 Volts and 220 Volts

.0005 µ{.

78

20,000 500

SCHEMATIC CIRCUIT

MODEL V-4 T.R.F. RECEIVER

78

PLUG RECEPTACLE LOOKING

AT BACK OF RECEIVER DOTTED LINES INDICATE CONNECTIONS TO

RECEPTACLE WHEN 110V At -DC PLUG IS INSERTED

77 38

t -V

I I O VOLTO

AG -0.0


EMERSON PAGE 1-11

678 EMERSON RADIO AND PHONOGRAPH

MODEL

Schematic Type 1

CORPORATION

MOD1

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(u)

'1a 0000Q M`ó

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12 EMERSON

MODEL 678 Schematic Type 2 EMERSON RADIO AND PHONOGRAPH

CORPORATION

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EMERSON PAGE 4-13

'MODEL 678 EMERSON RADIO AND PHONOGRAPH CORPORATION

nstallation Notes

INSTALLATION PROCEDURE

(Follow closely for easy installation)

1. Open carton, unpack set and check equipment furnished.

2. Remove the two thumb -screws holding the mounting plate to the radio cabinet proper. Tip the

mounting plate back and unhook it.

3. Remove the top cover and check visually conditions in general, i.e., tubes, grid caps, remote tun-

ing drive, etc.

4. Using the mounting plate (Figure I) for exploring, determine the most satisfactory position for

mounting in the car. As the mounting plate has the same area as the frontal area of the radio cabinet, any

space which will accommodate the mounting plate will be satisfactory, (allowing clearance for the set

to tilt forward for inspection after being installed).

5. Using the mounting plate as a template, locate the holes for the three mounting bolts. Check

under engine hood to see if bolts will be clear. Optional mountings may utilize 2, 3, 4 or 5 mounting bolts.

6. Drill these three holes. Suggest using IA" drill as a pilot hole then finish with % drill.) Put one

lock washer on each 5/16" bolt and insert thru the plate. Put a nut on each bolt and fasten securely against plate. Put a spacer nut and lock -washer on each bolt and mount the plate on auto bulk -head. Allow %" to 1" clearance between back of mounting plate and bulk -head for ventilation and good tone quality. Now tighten the bolts from the engine side of the bulk -head using a lock -washer and nut for

each bolt.

7. Before proceeding further, at this time, check the polarity of the car battery; that is, determine which side of the battery is grounded. This may be done most conveniently with a low reading D.C.

volt -meter. However, experienced mechanics may recognize the positive terminal of the battery by the fact that it is usually larger and blacker than the negative terminal. If there is any corrosion present, GREEN corrosion will be round at the POSITIVE terminal. Do not take chances or guess at the polarity but use every means to determine it correctly, as the wrong connections may cause serious damage to the receiver and car battery!

8. If the POSITIVE terminal of the battery is grounded, no changes are necessary and the installation may proceed.

If the NEGATIVE terminal of the battery is GROUNDED, it is required to make a slight change in the receiver. This is done quite conveniently by removing the top strew and loosening the bottom screw holding the serial number plate to the right side of the receiver cabinet. Tip the plate down and reverse the red and black -marked spade lugs. When this is done, the black -marked lug will be on top and the red -marked lug will be the lower one. (See Figure II and red tag on battery cable.)

/ns de nuf shoo//be od i/s/ed /or,wo,oer soacinf /Torn füe wo//. Na/ /o hold

e7o/ns/ dr,beis side or /;:e eze,.

This nu/s/lou/dde ou/ed u,o /i9A/ ov enyine s/a/e ol'lze

rav//.

toCéwosóei foes on eny/na si/e of lie

F I FiG. 2

º_ e

'ED l\.

BLACK°

LEADS APE SHOWN CONNECTED AS SET LEAVES FACTORY FOP OOS/T/YES/dE O, CAP BATTERY CPO/JADED.

Q/GNT HAND END OF Bar

S2

BLACK

RE fir ' . .

/F NEGAT/YE Sipe OF CAP BATTERY /S C.POUA'D O Lri4ACcT AS SHOWN NERE.

.e/GNT HAND END OP BUY J1.


14 EMERSON

MODEL 678 Installation Notes EMERSON RADIO AND PHONOGRAPH

CORPORATION

9. Replace the top cover on the receiver cabinet, using the screws to fasten it and attach the radio cabinet to the mounting plate; first, by hooking the two hooks on rear of the cabinet into the slots of the mounting plate; second, by inserting the two th umb-screws into the holes on the top of the mounting plate and screwing them into the holes of the cabinet. This completes the mounting of the radio cabinet.

10. Attach Remote -Control Unit to a convenient position on the steering wheel column, allowing the cables to take a smooth path to the set. Leather strips are furnished to accommodate unusual size steering wheel columns and also to prevent marring finish. Screw down the set screws in the center of the clamps in order to ground the remote -control unit to the steering post. Fasten the cable to the steering column and other points in order to prevent vibration and interference with the operation of the car.

11. Connect the two -conductor shielded cable to the battery, the BLACK wire always connects to the GROUNDED terminal of battery and the YELLOW wire always connects to the HOT terminal of battery regardless of polarity. (Re -read and check paragraph 7.) It is advisable to run this cable as directly as possible to the battery, keeping away from the engine compartment and other high tension wires. Grounding the cable as often as possible along its entire length reduces motor noise and is recommended. Poor connections at the battery terminals cause noise; therefore, clean the terminals and make' good connections. (Connections to the ammeter are not recommended, in general.)

12. Before connecting the antenna, check it for a possible ground. If ungrounded, connect to the antenna lead of the radio by splicing a good connection, taping the joint and sliding the section of insu- lated tubing over the connection. In the event that the antenna lead-in is shielded, do not neglect to connect the shielding to the shielding on the antenna lead from the set. A word of caution here: Do not run the antenna lead-in thru the engine compartment and keep it away from all high-tension parts and leads. Ground the shielding of the antenna lead-in along its entire length, if possible.

13. Turn switch -key halfway in remote control unit. The dial should light up immediately if every- thing is correct. Turn volume control (small knob) clockwise to a position for loud volume and when the tubes are warmed up, turning the station dial (large knob) will tune in stations. Adjust volume by the volume control knob, never by detuning the station, as this ruins quality. The separate, delayed automatic volume control will counteract fading and blasting and requires little or no adjustment by the manual control.

14. If the installation thus far has been carefully followed, starting and running the motor causes very little interference generally. However, the amount of motor noise WITHOUT SUPPRESSION may be noted as a check on a good installation.

15. Fasten the condenser supplied for generator -noise -suppression by slipping the grounded lug of the condenser under a screw in the generator frame. Connect the live lead of the condenser to the generator side of the cut-out relay mounted on the generator (connecting the live lead to the battery side of the cut-out relay is more effective in some cases. This may be determined by test.)

LEAo ro O/srR/BL/TO.o

LEAD TO D/SrR/EUTOR

SUPPRESSOR

SPA,PA- PLUG NUT

SPARA' PLUG SUPPRESSOP

VE.PT/GIL MOUNT NOR/ZONTAL MOUNT

Fig. 111

16. Fasten a spark plug suppressor to each spark plug (see Figure III) and the distributor suppressor in the head of the distributor. Fasten the suppressors firmly to the plugs and to the leads so that the connections will not shake loose and ground. If special types of suppressors are required for certain cars, these may be obtained.

17. In general, this should suppress motor noise effectively. However, an auxiliary suppressor condenser connected from ground to battery side of ammeter may sometimes prove effective. (See further details under "Notes on Ignition Suppression.")


EMERSON ['AGE 1-15


Tubes: 1-78, 1-6A7, 1-6B7, 2-41 (5 tubes). Total Battery Drain: 4.8 amperes. Max. output: 4 watts. Electro -Dynamic Speaker Field Resistance: 6 ohms.

Vibrator: Full wave synchronous rectifier.

Tube -Functions and circuit analysis:

1 Radio -frequency amplifier 78 2 Automatic fidelity control

3 Automatic selectivity control

6A7 {4 High gain modulator

5 Electron coupled oscillator

6 High gain I. F. Amplifier 7 Neutralized space -charge diode

detector

6B7 8 Separate delayed automatic

volume control 9 Automatic noise suppression

10 Reflexed audio -frequency amplifier

41 11 Push-pull output tube Class A"

41 12 Push-pull output tube Class A' 13 Fill wave synchronous vibra-

tor rectifier

lFS! t, )R/N4f45 L OCATEO ON BACK OF TN/S COIL

.5w/file-PAW! ¿rip

PfN07E CLWTPLY OP/YE

CABLE

CABLE TO REMOTE 004,1101 fad SM/TCH ANO YOLOA:E 00W740(

Pt ANO CSC/LLATOS TR/MM('S 1001740 O.v EPONr OF CONDENSER NOSE SUPPRESSOR NEPE TONE 00407100 HERE

- TOP Y/E/Y OF RECE/VER fV/Tf/01/7 CO keg - Fig. IV

MODEL 678 Voltage, Socket, Adjustments

rE[Loor e eLACN LIADO CONNECT TO STOPACI 541' 7E1V

TELL OW Buch -

PEA/Ore 740/S L/CENSE PLATE FOP PEW/TS/NC

C EÁ05 MENT/ONf0 /N /NSTPC/CT/ONS.

VOLTAGE ANALYSIS

Use a high resistance voltmeter. signals received.

Storage battery should be fully charged. Readings taken with no

Cathode Screen Grid Plate Heater

Tube to Ground to Ground to Ground to Ground

78 3- 3.5V. 75-85V. 200-210V. 6V.

6A7 3- 3.5 75-85 200-210 6

6B7 3.5-4.5 75-85 200-210 6

41 14-18 200-210 190-200 6

41 14-18 200-210 190-200 6

Voltage across speaker field -6 volts.

ADJUSTMENTS The receiver was carefully adjusted and aligned when it left the factory. Under no conditions should

these adjustments be disturbed unless there is no question that it is absolutely necessary.

Intermediate -Frequency To line up the Intermediate Frequency Amplifier, use a good modulated oscillator giving 172% K.C.

and a rectifier type output meter. Connect the oscillator output to the grid cap of the 6A7 and ground. Connect the output meter across the voice coil of the speaker or across primary of speaker transformer.

Ground the antenna lead and turn the tuning dial so that no signal is received (other than the test oscillator), with the volume control set at maximum volume.

Using the smallest output from the test oscillator to get an output reading, adjust the double -tuned input transformer and the single tuned output transformer for maximum output. It is preferable to use a non-metallic screw driver for this purpose. (See Figure IV.) Radio -Frequency

To line up the R. F. section, due to the extreme sensitivity of the receiver, use only a high-grade oscillator. Couple the oscillator through a standard dummy antenna to the antenna lead and ground of the receiver. Attach the output meter to the voice coil of the speaker and align the trimmers on the variable condenser for a weak high frequency signal (between 1350-1450 K.C.). Readjust the trimmers to get accurate settings. (See Figure IV.)

If a high grade oscillator and output meter is not available, it is suggested that the alignments be made on broadcast. Tune in a weak station between 1350-1450 K.C. and align the trimmers carefully. Readjust the trimmers as above.


16 EMERSON

MODEL 678 Notes, Changes


The following changes and additions are the effects of improvements in mechanical and electrical con-

struction made on the "Auto Dynamic"-Model 678-since the release of the "Service Manual"

Paragraph 10 of the section "Installa-. tion Procedure" should read:

10. By means of the adjustable strap supplied, fasten the remote -control - unit in a convenient position on the steering column, allowing the cables to take

BATTERY) a smooth path to the set. The procedure CONDUCTORS to follow being to place the end of the YEEIOW "KNOT

BLACU'GR°°N° strap with a single hole under one of the,

/pENOVE TNit holes in either flange on the control head. Place a bolt through the holes, slipping

REVERSE CON- NECTIONS NEU- a lockwasher and nut on the other end.

INS

RuCTNON T. Do not fasten the bolt; leave it loose

temporarily. Twist the strap through a radius around the steering column so that

NOISE SUPPRESSOR} `TONE CONTROL with a snug fit one of the three remain-

-TOD VIEW OF RECEIVER WITHOUT COVER- Ing holes in the strap lines up with the hole in the other flange of the control head. Insert a bolt through the two holes

that line up under these conditions and slip a lockwasher and nut on this bolt. Finally fasten both bolts securely so that the control head will not turn. Bond the cables at numerous points along the steering column to eliminate vibration and prevent interference with the operation of the car.

* * * * *

Paragraph 13 of the same section should read: 13. Place the switch -key in the slot provided for it and. turn clockwise until a snap is felt and the

dial illuminated. The light will indicate that the receiver is properly wired and ready to operate or ready for advance in installation procedure. Turn the volume control completely clockwise by means of the switch key to the maximum volume level. When the receiver is warmed up (this will be indicated by noise) tune a station carefully to resonance by means of the right-hand knob. Re -adjust the volume to a

satisfactory level. Never attempt volume attenuation by de -tuning the station, as this will distort the quality of tone translation. The separate, delayed -automatic -volume control incorporated internally will tend to counteract fading and blasting, retaining the volume at the level determined by the manual volume control.

The illuminated dial and the tuning control mechanism are mutually self -aligning. If the calibration of the dial does not check reasonably well with the frequencies of the stations received, it is only necessary to turn the tuning control knob slowly clockwise until it stops. If the dial pointer is at the extreme counter -clockwise position they are aligned. If not, turn the knob slowly, counter -clockwise, until it stops and the dial is completely clockwise. If either or both these instructions are carried out the calibration should check.

FIG. IV (Substitute for Fig. IV. now appearing in "Service Manual".)

THE FOLLOWING NOTES APPLY TO THE SERVICE SECTION

If it becomes necessary to disconnect the remote control unit; progress by loosening the two set screws which clamp the volume control cable to the lower stud on the receiver case, and by pulling the cable totally out of the recess provided for it. To detach the turning control cable, remove the cover of the receiver box and loosen the set screws which hold the cable to the worm gear drive. Unbind the two set screws which hold the cable to the receiver box and pull the cable out. Lastly, remove the bottom of the set and unsolder the two connections for the pilot light, pull it out of the grommet and the operations are complete.

To replace the control unit, it is only necessary to reverse the above process, being sure that the "tongue" of the volume control cable slips into the slot provided for it. This may be accomplished b' rotating the volume control knob slowly, and pushing the cable in simultaneously until the tongue en- gages the slot.

Replacement of the fuse in the event of a burn -out requires a removal of the floor board of. the car. Remove both cables from the battery and unlock the fuse receptacle in the yellow- lead, the fuse should drop out easily. A fuse of 10 ampere capacity, as indicated on the defective fuse, should replace it. The cause for the burn -out of the fuse should be determined before a new one is put in.

TONE CONTROL ADJUSTMENT

The adjustment as the receiver leaves the factory is set for full register reproduction. This is

recommended for closed cars and for vocal programs. Turning the control clockwise brings up the low

tones and is recommended for open cars and musical programs. Incidentally in this position, static and

other noises are decreased greatly. Do not turn clockwise more than necessary as definition of speech

may be lost due to the attenuation of higher tones by the car interior.


EMERSON PAGE 4-17

MODEL L-755, 50-L EMERSON RADIO AND PHONOGRAPH Schematic, Voltage

CORPORATION Sooket layout, Note

The L-755 is a de luxe superheterodyne receiver incorporating the latest features in medium and long wave receiver design to achieve unusual performances on both the 1500-535 kilocycle and 150-320 kilocycle bands.

The upper center knob is the Station Selector Control govern- ing the frequency calibrated dial directly above it. The lower center knob is the Band Selector; when turned to the left (counter -clockwise) the medium frequency band is the reception band and the lower dial numbers indicate the frequency; when turned to the right (clockwise), the low frequency band will be received and the upper numbers will indicate the frequency.

The left hand knob is the Tone Control; the right hand knob the Combined Volume Control and Switch.

The black wire protruding from the rear of the chassis is the ground wire; the colored wire next to it is the lead to be connected to the antenna.

Voltage üReadings Readings should be taken with the Volume Control turned clock-

wise as far as it will go and the Station Selector set for 550 K. C, Use a high resistance (1000 ohms per volt) voltmeter.


DP

TUBE LAYOUT

o TP O O

P O O C 0 0 H H H H H H H H

58 55 59 56 3-4 v sa

220-235v. 6-719:53220-235V. 58235-250Y. o ,., f05-115EC-23 _13 1 17-33 .2-7-32 R.F k ^ .X=3 /aOel. d7-30 f..F ./7-35-A 50,000 03foE Ou I

/000 /R-43

60-70Y.

95-105Y.

SG SP

C --CG

mm

Y /C-47 .5frf

65-90V

30,0)0 AS -7

DP

e

6-7V.

95- 103E 103K

RAW es 1000 /FIS

/éss ®

G2

YO.ipSíp/ÇÇ/IB/IAr/ i10:r are f0/.i.F4^d

C7 23

- SC//EM.I7/t7 C/2CU/7- P - NCYaEL L -7S5 RECE/YEß-

G3

/r-45 8 0 /-L-33

5

240-255V, P3p/. EC -23

È /0-40 3004.00vor IF PEAK 115 KC.

Corrections:. Omit 50,000 ohm Resistor from Triode Plate to Coupling Condenser. GR -34, 59 Grid Resistor changed to JR -47, 3 meg. Resistor.


'AGE 4-18 EMERSON

MODEL M-755, 50-M Schematic, Voltage EMERSON RADIO AND PHONOGRAPH Parts List CORPORATION

0000v-) O v in v M

Ì Ì Ì Ñ Ñ Ñ N

to

I

v

y to U 6 C1

Part No.

M -AC -7

Description List Price

GT -20 Antenna Coil $ .65 each

GT -21 Interstage R.F. Coil .65 "

GT -22 Oscillator Coil .65 "

ET -17 I. F. Transformer 1.15 "

GT -23 Power Transformer 1.95 "

GR -28 Volume Control .80 "

GR -29 Tone Control .60 "

GR -30 12,500 ohm 2 wt. Resistor .25 "

Any other Carbon Resistor (specify Part No. and value-refer to diagram for value) .15 "

EC -16 3 -Gang Variable Condenser 2.45 "

BC -9 8 & 8 mfd. Electrolytic Condenser .65 "

Any Size Tubular or Mica Condenser (specify Part No. and Value - Refer to

diagram for Value) .10 "

Any socket (specify tube number marked on socket) .08 "

GD -5 Dial Assembly .90 "

AL -2 Pilot Light 08 "

AK -1 Knobs .10 "

GS -19 Dynamic Speaker 5.65 "

GF -M Yo ume

PE c/:zi Sd

f' De/ Sd

cPd/

cQ-30

OJG 56

NOMENCLAIU4E CC,rJjz4 uf([DOEFD

AN17.1[0/G 5/ j000pO0Á 3/

M'A7r

(.l-jl (LOCDPFOff[[/lQe e[ fF10IS,OdOh/y 7-/1 / 3Kf SN/fLDED// CA SI" LPi1 7-r! POWEe 1PANJ/0A.EP AP -9 500,020^ C -/i GANLEO CáÑOEN.(ER GP'N 600 000 / /I

1!qq 5n060p0^Y LL.vUIFECON7P9L EC -9 A-tAl//S`LV7FEAK

!d . J000Oa t WArETdsFO1 iC-r9 é1Fl

EI -/7

AL -6

` ÁC; ;/// "id ONMS

I E 215. LL! -Af Pacpr 0u/pu/ Sd JS nS0,000 7C29 f7

AC Lae PA/9

E7--/7

N

40F or C.' SpeDMr ,krlr/

Speaker C/uq-,

oF Babiiy fo//

/ /600h ilu ra 000000oF

Os

EC. -ri

IF PEAK 175 KC


EMERSON PAGE 4-19

MODEL S-755, S-50

EMERSON RADIO AND PHONOGRAPH Sohematio, Voltage CORPORATION Socket layout

Voltage Readings: Readings should be made

sistance of 1,000 ohms per volt. using a D.C. voltmeter having a re - Volume control should be on full.

58 Oscillator _____.__Ground to plate 230-245 Screen 120-140 Cathode _ 58 R.F. Amplifier_._ Id " " 235-250 90-110 " 3-4

58 1st Detector 11 235-250 11 " 1-2

58 I.F. Amplifier__ 11 1{ " 235-250 90-110 3-4 57 2nd Detector _-- 11 11 100-125 It 90-110 4-6 59 Output tube _-- I( 230-245 235-250

Line voltage, 115v.

The bias on the 59 and the screen voltage of the 1st detector cannot be read with the usual voltmeter.


fEs/

1C-52

11

64x25

Î200

YS l71,á, w

e4

17-2 465K.C; 27 SC//E»T/C C/BCU/T d1ODEL-S-7-

465KC EC -1J 53 R i. 1C--5/ l 55 DEE !. .T-:3/ 5e I.F. 12-3/ 57 DEE. A.?. -5 59 L171K'EP

\ 4 . 15-27 u4

¿C-52 1C-55 59 0SC.

:5.-27

LC 46 LS -27

LC -40

Lß04 50 000

.0 Sc.

1..&ti45 /000'.

00.0w S.C.

40,000'. ?.C.

15-71-cs. dsri/cÁ Posi/ice 6- 2/ .xyocyc/es

2 -55-55 3 -/.4-47

- 4 650-1500 .e//OCyC/C.A

y2}/49r.t,37.7AE L,Ç00 - 300-óoascrcf 3es7i-Yeiivb.N / - 3654.(4./ C ro LC -42 - 5-92 fl/o/%

/ y( .( SeC//liJ Cha e toi/ /C-13 -5¡{rfr/io/v/iC '-2J' - PtNei Tio//si L'-d4 - .03.6.2$ soiio E.C-73 -.03x/300i,'

LC -46

I.F PEAK 465 KC

//.=45 -./a/300 IC -SI -M.raE.n2t ('-4C -.5.stWov. ¡¡C.-52-.002ír/17iCo.

1C.-47- ..5s.2 zoos. LC -53 -.000/.nice /C fB - Oo./u-M/Ce AZ-47..0005,r/.n/cc

a'7 42-4 -250.000d L 9 aK3 -50_000°1 1t'.-49-. /7s m/ai

C-50 - 9 "MA

#2-42. 2 .ncr 04: S3-ro4000.' C2-34- 400000`ß c2.-ºe.sedo-io uTa

CO OA/r..s c.Pes...e.. 1A, p,R=/

4'47 11 C?34

AQ -4

C.P.-33 G4..if

.SQ2B`1l F uy

/23-J2 4f


l'ACE 4-20 EMERSON

No. 2

No. 3

V4Z HT -24

HT -25

QT -61

QR-77 QC -77

QC -78

QW-28

HS -24

Part No.

IT -27 IT -28 IT -29 IT -31

GT -23 GR -28

IC -41 IC -42

ID -6 AL -2

IS -29 IT -30 IC -39 IS -27 IC -40 IZ-29

MODEL 375, 40 MODEL 420 MODEL S-755, S-50 I)DEL L-755, L-50 Parts List Description


Model 375,40 LIST PRICE P -T-67 Antenna Coil in Shield $ .80 each P -T-68 Interstage R.F. Coil in Shield .80 P -T-66 Composite I.F. and Oscillator Coil 1.20 L -T-41 2nd I.F. Transformer in Shield 1.20 L -T-45 Filter Choke .60 P -C-82 Variable Condenser -3 -Gang 2.40 P -C-83 Filter Condenser -Triple 4, 12 and 16 1.40 I -C-43 Roll Type Electrolytic Condenser -5 Mfd. .50 E -C-19 .5 Mfd. Roll Type Paper Condenser .20

Any other Roll Type Paper Condenser .12 Give size or location in the circuit.

Any Socket -Give Tube Number .12 di

Any Carbon Resistor .14 14

Give value or location in circuit. I. -R-59 Ballast -Resistor 160 -ohm 15 -watt Wire

Wound .40 IC

P -D-9 L -B-3

Vernier Dial Complete Pilot Lamp Socket

.60

.10

11

if

K -L-6 Pilot Lamp Bulb .15 IC

PR -81 Volume Control with Switch .90 PS -52 Dynamic Speaker 4.50 If

Special 220 -Volt Ballast Resistor 2.00 For operation on 220 -volts.

No. Description Model 420 P=fe No. 1 EMERSON 6 -Volt "B" Eliminator and Cable.

(For automobiles and motorboats, camps, etc.)_._ $15.00 each

220 -Volt Ballast Adapter (where 220 -volt AC or DC current is available)_...._.__._-_._..._._..__...__......__

EMERSON 32 -Volt "B" Eliminator and Cable (for farm lighting plants and wherever 32 -volt power is used) ___.-__. _-__..___ --._ __-._- 15.00

Zipper Type Carrying 2.00

R. F. Coil Filter Choke Volume Control and Switch._._._... ._.._-___-__...___

Variable Condenser Dual 4-mfd. Electrolytic Condenser Power Cord and Resistor with 7 -prong Socket and Line Plug-

SpeakerAny

Carbon Carbon Resistor. (Order by size)___._._._. ...... _.__

Any Tubular Condenser or Mica Condenser. (Order by part .......

Any Socket. (Order by tube number)_...._..........__......._._

Description Model S-755, S -50

Antenna Coil $ 90 each R. F. Coil 90 "

Oscillator Coil I. F. Transformer 105 Power Transformer . 2.25

Volume Control --.__. ___--..___...___-.______ .80

Any Carbon Resistor (specify Part No. and Value - refer to Diagram for Value) _______________ .12

3 -Gang Variable Condenser 2.30 Double 8 Mfd. Electrolytic Condenser_...--__....-_ 1.25

Any size Tubular or Mica Condenser (specify Part No. and Value -refer to Diagram for Value)... .20

Any Socket (specify Tube No. marked on Socket)... .10 Dial Assembly -__...._--._. ._._.._. __..._._.__ .90

Pilot Light __-_____.___ _ __._.._. -. _..__ .12 Knobs - -- - ---- - .._..__.... .15

Dynamic Speaker _.__._._. -_._....__.__ _.._......_.___ 5.90 Four Section Universal Choke Coil_..-___....._ .............__ .45 Selectivity Control Condenser - .60 BandSwitch _._-..._...._.__..__.._-_.____._._....___..........._......._...._ 1.50 Adjustable Padding Condenser _...._....._....._

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FADA PAGE 4-3

MODEL "RX" FADA RADIO & ELECTRIC CORP. Alignment data

ADJUSTMENT OF LONG -WAVE PADDING COMPENSATORS

Two (2) of the compensators are located on the right side of the chassis and one in the front as indicated in the sketch. These compensators can be readily identified by the red mark placed on the adjustment hole.

1st - Turn the band selector switch to the long - wave position and adjust the carrier frequency output of the signal en erator to 856.6 meters (350 kilocycles).

2nd - Set the calibrated dial of the Receiver to read 856.6 meters (350 kilocycles).

3rd -- With the aid of a 1/4" (#4) socket wrench, adjust all three (3) padding compensators in the order marked in the sketch.

ADJUSTMENT OF LONG -WAVE OSCILLATOR SERIES CONDENSER

The long wave oscillator series condenser can be adjusted through the hole in the side of the chassis as indicated on the sketch.

1st - Adjust the carrier frequency output of the signal generator to 1999 meters (150 kilocycles).

2nd - Set the calibrated dial of the Receiver to read 1999 meters (150 kilocycles) .

3rd - With the aid of a 1/4" (#4) socket wrench, adjust the long wave oscillator series condenser until a maximum output signal is indicated on the output meter. To insure perfect adjustment it is permissible to "rock" the variable condenser back and forth in order to follow the maximum signal output.


4 FAI)A

RESISTOR-CONDENSER Specifications FADA RADIO & ELECTRIC CORP.

IDENTIFYING BY-PASS CONDENSERS

PART # CAP. VOLTS TYPE

1238 Ms 1.0 Lif d 200 Volts I 1239 Ms 2.0 200 I 1240 Ms 1.0 400 I

1241 Ms 0.5 200 I

1242 :is 0.5 200 1

1418 Nis .25-.25 200-400 II 1419 Ms .5 400 C

1490 Ms .15 400 I

1225 Ms .25 400 I 2-1307 Ms .07 400 I 2-1340 ".Is .25 200 I 2-1341 .25-25 400-400 III 2-1353 Ms .25-25 200-200 II 2-1360 Ms .25-25 200-200 III

On the above, type I has two lugs. Type II has three leads and a red lead connects to a 400 volt section, a brown lead to a 200 volt section and the black lead is common.

Type III condensers have four leads. A red lead connects to 400 volt sections and a brown lead to 200 volt sections. Thus a 400-400 condenser has two red leads and two black leads, a 200-200 condenser has two brown leads and two black leads. The black leads are not on non in type III.

Wound Resistances in Fada Sets

Wire wound resistances used in .Fada receivers are identified by spots of color in accordance with the list- ing below. If you wish to order any of these resistances, be sure to specify both the part number and the value of the resistance in ohms. Your careful attention to this detail will result in our being able to give you much prompter service.

Our Part No.

1458 -Ms t4í4 -Ms 1459 -Ms 146o -Ms r46í -Ms 1328 -Ms 2 -1219 -MS 1415 -Ms 2 -1218 -Ms 1416 -Ms 1462 -Ms 1463 -Ms 2 -1249 -Ms 2 -1250 -MS 2 -1251 -Ms 2 -1311 -Ms 2 -1312 -MS x 1379 -Ms 2 -1390 -Ms

Resistance in Ohms

75 250 500 600 750

1,000 1,200 2,000 2,500 3.000 6,000

10.000 65

65 Tap at 40 10 20

200 taps at 1 o 14 16o 1500 5000

Identification

Red is White Yellow E4 White

Blue E4 Green Red £4 Blue

Red e3 Green Yellow

Green f4 Yellow Green £4 White Blue t4 White

White 14 White Red £4 Yellow Blue Y4 Yellow

Red Blue

Yellow White Green

Red t4 Red Blue E4 Blue

How to Identify Fada Carbon Resistances

All fixed resistances used in Fada sets are identified by color. If you wish to order any of these resistances, please be sure to specify both the part number and the value of the resistance in ohms. This will result in giving you much prompter service.

Our Part No.

Resistance Ohms ± t o% Identification

Diameter in

Inches

14o8 -Ms 2-Megs Red 4" 2 -1299 -MS 250 Light Brown 1/ "

2- 1300 -MS 750 Green "

2- 1207 -Ms 2000 Black "

1265 -MS 3000 White 2-I3o8-Ms 5000 Orange 1341 -Ms 20,000 Green l ' 1417 -Ms 50,000 Blue n

2 -1315 -MS 70,000 Violet 14 1375 -MS 125,000 Gray 131 I -MS 250,000 Yellow i4 1394 -Ms 1467 -Ms

500,600 2000

Brown None

2 -1330 -Ms 3000 White h 2 -1334 -Ms 1200 Dark Green 1/4

Green with 2 -1344 -Ms 1000 yellow end

Red with 2-1 345 -MS 2500 yellow end 3/a

Gray with 2- 1346 -Ms 125 yellow end %"

Blue with 2 -1347 -Ms I0,000 yellow end %"

Brown with 2 -1358 -Ms 500 blue end

Yellow with 2- 13 64 -Ms 7500 blue end.

Carbon Resistances Carbon resistances it will be noticed are of two dif-

ferent styles. The black units with tinned ends have small spots of paint for identification of their resistance values. Another type have leads soldered on them and the entire unit dipped in an insulating paint of identifying color. In addition some of these units will have the part number stamped on them. The following is a table of identification.

Part No. Resistance 1265 -MS 3,000 ohms 1311 -MS 250,000 ohms 1341 -MS 20,000 ohms 1375 -MS 125,000 ohms 1394 -MS 500,000 ohms 1408 -MS 2 megs 1417 -MS 50,000 ohms

Black Unit Identification

White and Yellow Gray and Yellow Red and Green Gray and Green Yellow and Black

Other Type Unit

Identification

Yellow Green Gray

Red Blue


FADA PAGE 4-5

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FADA PAGE 4-7

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FADA PAGE 4-11

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FRANKLIN PAGE 4-3

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10 FRANKLIN

MODEL 94 Notes FRANKLIN RADIO CORP.

ALIGNMENT OF FRANKLIN MODEL 94 ALL -WAVE RADIO RECEIVER

Receiver should be circuit tested, and any high or low voltages should be corrected. This will reasonably insure the correct use of the resistors. However a visual inspection of the resistors and condensers should be made so that the alignment operations which are to follow will not be frustrated. A table of voltages which are to appear at the various terminals is appended. When circuit testing is completed, proceed as follows:

(1) Set up signal of exactly 450 Kc, 30% modulation, 400-1000 cycles, oscillator to be very stable.

(2) Either apply high resistance voltmeter (AC) across plates of 59 tubes, or insert 15 MA DC Meter in the common cathode lead of the I.F. tubes (in lead to rotor of sensitivity controll,or if tuning meter is used simply observe tuning meter variations.

(3) Apply I.F. Ose, signal lead to grid or #2 I.F. tube.

(4) Adjust trimmers on #3 I.F. Transformer for max. signal and max. reading on sensitivity indicators.

(5) Apply I.F. Oec. signal lead to grid #1 I.F. tube and repeat operation #4 adjusting trimmers on #2 I.F. Transformer.

(6) Apply I.F. Osc. signal lead to antenna post and adjust trimmers on #1 I.F. Transformer and observe as in #4.

NOTE: Speaker is never disconnected so that audible signal is always present to aid peaking operations,

(7) Set wave band selector switch on B.C. Band (Farthermost clockwise position).

(8) Set tuning dial at 1500 Kc., checking that dial reads 100 when gang condenser is completely closed,

(9) Apply 1500 Kc. Osc. signal (30% mod. 400-1000 cycles) to ant-gnd posts.

(10) Adjust trimmer on osc. section of gang condenser (section #1) for maximum signal.

(11) Adjust trimmer on first detector grid coil (Trimmer on section #4 of gang) for max. signal.

(12) Adjust trimmer on B.C. Preseloctor circuit (Trimmer on section #3 of gang) for max. signal.

(13) Sat tuning dial on 570 Kc. and adjust osc, signal to exactly 570 Kc.

(14) Adjust serties osc. padding condenser for max. signal (condenser C-3 on circuit diagram) (this condenser is located beneath chassis but is adjusted from top of chassis thru hole in chassis. It is the trimmer located nearest to front of sot).

(15) Check peaking at 1500 Kc and make minor adjustment if necessary repeating operation 10.


FRANKLIN PAGE 4-11

FRANKLIN RADIO CORP. MODEL 94 Notes

(16) Check alignment at about 800 Kc to see if osc. and 1st det. are tracking.

(16-A) If when checking alignment at 800 Kc. and it is found that 1st det. does

not track with oscillator, necessitating an increase of trimmer capacity

on section 4 (also then on pre -selector section #3) then proceed as follows:

(a) Turn dial to 1500 I;c.

(b) Loose set screw on dial and turn dial on the condenser shaft

about 1 or 2 degrees counterclockwise and re -lock with set screw.

(c) Then proceed with operations #8, #9, #10, #11, #12, #13, #14,

#15 and #16.

Alignment should now be better at 800 Kc. or perfect. If not, repeat

operation set down in #16-A. Of course if in 16-A it was found that trimmer

condenser had to be reduced in capacity on section #4 (also then section

#3) then reverse the direction in which the dial was slipped on the gang

cond. shaft (move it clockwise in this case). Repeat the same operations

as outlined in 16 -A -c above.

(17) Move band selector switch to next higher freq. band (1550-4200 Kc.)

counterclockwise one notch.

NOTE: AFTER COMPLETION 0. OPERATION 16-A DO NOT TOUCH TRIPS ON SECTIONS #1, #3, and #4 OF GANG CONDENSER.

(18) Set up 4000 Kc. Osc. signal and connect leads from oscillator to ant-gnd

posts on set. Turn dial of set to max. signal (will be close to 0 or

1500 Kc. on tuning dial).

(19) Adjust 1st det air -trimmer (located on control panal, second knob from

left) for max. signal. If max. signal is secured at either extremity of

this control travel, than it will be necessary to make coil adjustments.

(a) If this trimmer peaked or attempted to peak at its max. capacity

then 1st dot coil lacks sufficient inductance (too few turns or

coil diameter incorrect). .

(b) If this trimmer peaked or attempted to peak at its min. capacity

(farthermost counterclockwise position) then 1st det. coil has

too high an inductance (too many turns). Remove 1 turn and re-

peat operation 19 until this first detector trimmer peaks the

4000 Kc. signal at 1/4 of its total travel from its farthermost

counterclockwise position.

(20) Set up oscillator signal at 1550 Kc. and turn tuning dial to farthermost

counterclockwise position (max. capacity).

(21) Adjust series osc. trimmer (C-2) (second from front of set, located be-

neath chassis but adjustable from top of chassis) until max. signal is

secured. 1st dot. air -trimmer should peak this 1550 Kc. signal some-

where in its range.

NOTE: If in operation #18, tuning dial did not pick up 4000 Kc.

signal at 10 or nearly 10 on dial, then oscillator coil for

this bind is in error having a wrong number of turns. This

difficulty must be corrected before proceeding with operations

#19, #20 and #21.

(22) Move band selector switch to next high freq. band (CC one notch)

(11000 to 4200 Kc.).


l'AGE 4-12 FRANKLIN

MODEL 94 Notes FRANKLIN RADIO CORP.

(23) Set up oscillator signal at 11000 Kc. Move tuning dial and gang condenser

to f;_rthermost clockwise position (min. cap.). Adjust cap. C-1 for max.

signal. (For operations which are to follow sut must be standing on

LEFT END. Condenser (C-1) is mounted on rectangular coil and snitch shield

beneath chassis.

(24) If 11000 Kc. signc.l cannot be tuned in with gang condenser at min. cap.

even after adjusting C-1, than osc. coil inductance is either high or low.

If inductance is lo -7 then 11000 Kc. signal cin be tuned in by increasing

g:ung cond. cap. (rotating gang). If osc. inductance is too high then this

fact cin be determined by varying Oscillator signal to some lower frequency

until signal is audible in receiver.

If this osc. eo.il inductance is incorrect, ermine the coil for correct

turns and diameter. Inductance c.,n be lowered by sliding last turn or last

2 turns away from rest of turns of coil.

(25) Check at what position the 1st det. air -trimmer peaks this 11000 Kc. signal.

Max. signal should b3 obtained .at about 1/4 total travel of this condenser

from its min. cap. setting. If this does not occur, then first det. coil

has wrong inductance value and must be adjusted by sliding end turn or turns.

Sliding turns outward away from main body of coil decre_ses inductance.

(26) Set up 4200 Kc. Osc. signal and move tuning dial and gang to Max. Cap.

Signal should be heard close to 100 on dial. Check 1st det. trimmer to see

that it peaks this 4200 Kc. signal within its tuning range.

(27) If in checking in #26 the 4200 Kc. signal cannot be heard (receiver does

not tune to 4200 Kc. signal) then the osc. coil inductance for this band

is too low and consequently C-1 in operation 24 was adjusted to too high

a capacity so that the facts in the case are that the osc. inde is too low

and distributed cap. too high. Therefore add 1 or L turn to osc. coil and

repeat operations 23, 24, 25 and 26.

(28) Check 1st det.trimmer at several points in this band. to see that it peaks

properly.

(29) Move band selector switch to next higher freq. band (22000 Kc. to 11000 Kc.)

(farthermost.CC position).

(30) Set up osc. signal at 21800 Kc. and move gang condenser to min. capacity

setting. Adjust trimmer on #2 section of gang cond. until signal is heard.

(3.1) If signal cannot be tuned in then osc. coil has too high an inductance and

must be corrected and same procedure followed as in #24 except that in this

case higher frequencies are used.

(32) Peak 1st det. trimmer at 21800 Kc. signal. (Be sure that #5 trimmer is set

at min. cap.). Should peak at 1/4 trimmer condenser travel from min.

setting. If this does not occur then and. of 1st det. coil is incorrect

and must be corrected. If air -trimmer closes more than 1/4 its travel the

inductance of 1st det. coil is too low .,aid conversely too high if trimmer

cond. does not close 1/4 its travel. Adjust and. of coil by sliding turns

inward or outward.


FRANKLIN PAGE 1-11

FRANKLIN RADIO CORP. MODEL 94 Voltage, Notes

(33) Set up osc. signal ut 11000 Kc. and move tuning di:a and cond. toward max. cap. At 100 or close thereto the signal should be heard. Be sure the signal received is the fundumental of osc. First det. trimmer should peak within its tuning range. No trouble should be encountered here unless some high distributed or lumped capacity has been introduced in 1st det. ircuit which should not be present. This must be corrected if 1st dot. trimmer does not peak correctly at 11000 Kc. signal freq.

(34) If signal is received at a much lower (5 to 10 div.) than 100 on dial then osc. coil Inductance is too high and should be reduced. Then repeat operations PO, #31, #32, #33 which will give a high capacity setting on trimmer on section #2 of gang.

(35) Check air -trimmer of 1st det. in various settings of gang between high and low freq. extremes to see that trimmer peaks at these points.

NOTE: When performing operations set down for the two high frequency bands no violent or sudden changes should occur in 1st detector air -trimmer settings. If such is experienced then operator has peaked trimmer on frequency on wrong side of oscillator.

CIRCUIT TEST VOLTAGES FOR MODEL 94 ;,LL-t4_,VE

Cathode 1st det. to gnd. 6; volts 30 volt scale Cathode oscillator to gnd. 0 volts ------- Cathode 59 tubes to gnd. 18 volts 30 volt scale Cathode 56 tubo 13.5 volts 30 volt scale Cathode 2B7 to gnd. 115.0 volts 300 volt scale Cathode I.F. Tubes to gnd. 130.0 volts 300 volt scale

Plate 1st Det. to gnd. 280.0 volts 600 volt scale Plate I.F. Tubes to gnd. 370.0 volts 600 volt scale Plate 2B7 to gnd. 280.0 volts 600 volt scale Plate 56 to gnd. 270.0 volts 600 volt scale Plate 59 tubes to gnd. 260.0 volts 600 volt scale Plate 57 osc. tube to gnd. 140.0 volts 600 volt scale

Screen 1st dot. tube to gnd.---140.0 volts 600 volt scale

Screen I.F. Tubes to gnd. 270.0 volts 600 volt scale Screen 2B7 to gnd. 140 volts 600 vdlt scale Screen 59 Tubes to gnd. 260 volts 600 volt scale

Screen 57 osc. Tub; to gnd.----120 volts 600 volt scale

Drop across 20 Henry choke 30 volts 30 volt range

Drop across field coil 105 volts

Normal "B" Voltage DC from filament 5Z3 to C.T. HV Trans. 400 volts Potential between cathode of 2B7 and cathodes of 58 tubes 3 volts

(Use 300 volt range) This is effective grid bias (no signal)

Also observe this polarity. Cathodes of I.F. Tubes should be positive with respect to cathode of 2B7.


14 FRANKLIN

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FRANKLIN PAGE 4-15


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16 FRANKLIN

MODEL 200

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FREED PAGE 4-1


2 FREED

MODEL 346-4 Sohematio,Socket Parts List

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FREED RADIO AND TELEVISION CORP.

I

I

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1 - Volurre oontrol- 10,000 ohm 2 - Antenna coil 3 - Variable condenser 4 - 300 ohm 1/3 watt resistor 5 - .05 mf 200 volt condenser

8 - .5 mf 200 volt oondenser . -iHIt 7 - Detector coil

8 - 30;000 ohm 1/3 watt resistor 9 - 5 mf electrolytic condenser 10 - 250,000 ohm 1/3 watt resistor

11 - .02 mf 400 volt condenser 12 - 500,000 ohm 1/3 watt resistor 13 - 500 ohm 1/2 watt resistor 14 - 5 mf electrolytic condenser 15 - .005 mf 200 volt condenser

16 - 4 mi 4 8 mf filter block 17 - 1800 ohm field 18 - Power Transformer 19 - 10,000 ohm 1 watt resistor 20 - 10,000 ohm 2 watt resistor

21 - .0002 mica condenser 22 - 50,000 ohm 1/3 watt resistor 23 - .1 mf 200 volt condenser


FREED PAGE 4-3

MODEL. 354 FREED RADIO AND TELEVISION CORP. Soheme.tio,Socket

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4 FREED

MODEL 355 Schematic Socket layout

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MOOS L .355 S TUBE [Milt/. SvP2

1 - .002 mf 200 Volta 2 - Antenna coil 3 - 10,000 ohm volume oontrol 4 - 3,000 " 1/3 watt 5 - Variable condenser*

6 - 400 ohm 1/3 watt 7 - 50,000 ohs 1/3 watt 8 - .0001 mf mica 9 - Oscillator coil

10 - 30,000 ohm 1/3 watt 11 - .1 mf 200 volt 12 - .1 mf 200 volt 13 - .05 mf 200 volt 14 - 456 KC Double tuned IF coil 15 - 456 IC Single ' "

"

16 - .0002 Tf mica 17 - .0002 mf mica 18 - 500,000 ohm 1/3 watt 19 - 50,000 " " 20 - .02 mf 200 volt

21 - 500,000 ohm 1/3 watt 22 - 2,500 23 - 5 ml 35 volt elec. 24 - .02 mf 200 volt 25 - 100,000 ohm 1/3 watt

26 - 500,000 ohm 1/3 watt 27 - 750 " 1/2 "

28 - 5 mf 35 volt elec. 29 - .005 mf 200 volt 30 - 14 mi filter cond.

31 - 270 ohm "B" choie 32 - 3,000 ohm speaker 33 - 25 mf filter cond. 34 - 160 ohm line cond. 35 - .1 si 200 volt 36 - 15 ohm Pilot Light 2ccl-ci 37 - 6.3 Pilot Light 38 - .00oa mf mica condenser

Tube LAYour

ocT. 26, i933 RB.G. F',eoNT


FREED PAGE 4-5

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MODL G S 3CO 360 X. 6 771.,e, A - C SUP cc T. 26J /933 44D,

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6 FREED

1ADDEL 365, 365x Sohematic Sooket layout

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Tu E. LAYOUT

(id, -g6 ,7s Sn7) z6

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1

2 > s 3 Ñ" 4

6 ói 8

7

9

10 11 la 13 14 15 16 17 18 19 20 21

$ 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

40 41 42 43

45 46 47 -

Short wave coil Batid switch 50-100 mmf padder Short wave coil 10 mmf mica 002 mf 10,000 ohm volume control Antenna coil 3 000 ohm 1/3 watt 400 ohm Variable condensers 50,000 ohm 1/3 watt .0001 mf mica Oscillator coil .1 mf 200 volt .1 n "

30,000 ohm 1/3 watt .05 mf 200 volt 456 KO Double tuned 456 10 Single "

.0002 mf mioa 500 000 ohm 1/3 watt 50,600 " .Oa mf 200 volt 500,000 ohm 1/3 watt .0002 mf ul i o a 2,500 ohm 1/3 watt 5 mf 35 volt elec. .02 mf 200 volt 100,000 ohm 1/3 50,000 "

3,000 " "

25,000 " " n

5 mf 35 volt Electrolytic .02 mf 200 volt 500,000 ohm 1/3 watt 750 " 1/2 "

5 mf 35 volt elec. (Filtermatic T.C. in 365X (.005 mf 200 volt in 365 14 mf filter cond. 3,000 ohm field 270 " "B" choke 25.1 mf filter cond. 135 ohm line cord .1 mf 200 volt 6 volt pilot lamp 15 ohm Res.

wat t n "

"

I.7. coil

Omitted from 3653 48 - 50,000 Ohm, 1/3 watt resistor 49 - .1 mf 200 volt condenser 50 - 6 mf 150 volt electrolytic con 51 - 1000 ohm, 1/3 watt resistor 52 - .0002 at mica condenser

,NOUt_LS 36_5 ar 365h'. UN/V.

fit RO.tiT. oc : ZG /953 Z,BD.


FROST MINTON PAGE 4-1

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MODEL 4 VI FROS'F-MINTON sohematio, voltage

Socket layout

41. aP

WM- 10 . +s1 _ wnni

..-m 4111P

QII

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6'11 i .1P do' ".

1/40 U J It\

The readings were made with the volume control in

the full "on" position.

*These voltages are the correct values. The average test kit will give much lower readings, (as low as 1/10 of these values) due to the low resistance of the meters compared to the high resistance included in the detector plate and screen circuits and the audio grid circuit.

When the volume control is reduced the

RF

RF RF

RF

-- + - _ 4p 41. ...... 41> «am. Ay. 41.

em ! me 4. .1

U

N

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J

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plate voltage remains constant

screen voltage increases

cathode voltage increases

grid voltage increases 1

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2 FROST MINTON MODEL 4 PNf

Electrical values Transformer notes

NOMENCLATURE C 1-Antenna Trimmer Condenser

C 2-Tuning Condenser



C 5-Alignment Condenset

C 6-Alignment Condenser

C 7-Coupling Capacity

C 8-Coupling Capacity

C 9-Audio Coupling Condenser .006 mfd.

C 10-Det. plate By-pass .0001 mfd.

C 11-RF Cathode By-pass .05 mfd.

C 12-RF Plate By-pass .05 mfd.

C 13-RF Screen By-pass .25 mfd.

C I4-RF Plate By-pass .05 mfd.

C 15-Det. Cathode By-pass 1.00 mfd.

C 16-Det. Screen By-pass .25 mfd.

C 17-Audio Grid By-pass .01 mfd.

C 18-Audio Plate By-pass .01 mfd.

C 19-Filter Condenser 4. mfd.

C 20-Field Condenser .08 mfd.

C 21-Filter Condenser 4. mfd. R 1-Volume Control 10,000 ohms

R 2-RF Cathode Resistor 300 ohms

R 3-Det. Cathode Resistor 50,000 ohms

R 4-Det. Screen Resistor 2 megohms

R 5-Det. Plate Resistor 1 megohm

R 6-Audio Grid Resistor / megohm

R 7-Audio Grid Resistor 100,000 ohms

R 8-Mid Tap Resistor

R 9-Divider Resistor 50,000 ohms

R 10-Screen Resistor 50,000 ohms

R 11-Screen Resistor 10,000 ohms

R 12-Audio Bias Resistor 400 ohms L I-Antenna Coil

L 2-Primary L 3-Secondary

L 4-Primary L 5-Secondary

} of RF Coil

Íof RF Coil

L 6-Speaker Moving Coil

L,7-Speaker Field Coil

T 1-Audio Output Transformer

T 2-Power Transformer

FROST-MINTON

Filter Condenser The three leads from the main filter condenser are

connected as follows:

Black -to center tap of 280 plate winding Green-to filament terminal of 2110 socket Red -to +B connection on terminal strip

By-pass Condenser Assembly The condensers

tified, as follows:

1.0 mfd. .01 mfd. .05 mfd. .25 mfd.

incorporated in this unit are iden-

Green Leads Green and White Leads Black Leads Red Leads

Resistors 300 ohms-Orange, Black, Brown 400 ohms-Yellow, Black, Brown

10,000 ohms-Blue, Yellow 50,000 ohms-Green, White 100,000 ohms-Blue, White

TA megohm-Gray 1 megohm-Black 2 megohm-Black, White

Power Transformer Six leads are brought out of the transformer winding

on the side next to the terminal strip. Three are located on the opposite side. The transformer is connected as

follows:

Primary Winding-Stranded wires, terminal strip side

224 and 247 filaments-Heavy wires, terminal strip side

280 filament-Small wires, terminal strip side

280 plates-Two leads nearest front of set, opposite side

280 center tap-Lead nearest back of set, opposite side

The trimmer condenser mounted on the loud speaker must be adjusted for maximum volume.

Some types of the 247 Pentode operate normally with a blue glow. This action does not, therefore, denote that the tube is defective due to gas.

It is very important that no tube is removed from its socket with the receiver "on" as to do this will damage the receiver or the Pentode tube. Make sure that the lead from the top of each 224 tube to the variable condenser follows closely along the metal partition between the tubes. Oscillation may occur if this lead lies too close to the tube itself.


FROST MINTON PAGE 4-3

FROST-MINTON

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MODEL FM -5 LiJDEI FM -4 Schematic

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· 2019. 7. 17. · {(+aUaF w V ) pp a 4. s F. tl P. G m ñ Ú -. 0 0 a tl .-4 . + V a 0 N ó R S...

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Transcript of · 2019. 7. 17. · {(+aUaF w V ) pp a 4. s F. tl P. G m ñ Ú -. 0 0 a tl .-4 . + V a 0 N ó R S...