Philco 37-61 Reference manual

• • • • • • • • • • • • • • 'Yflo.rM 37-61
Special Data for Members of
RADIOMANUFACTURERSSERVICESERVICE BULLETIN
No. 146
A PHILCO SERVICE PLAN
Model 37-61
General Description
Model 37-61 is a 5 tube superheterodyne receiver for operation
on alternating current and has two tuning ranges, covering
standard broadcast and short wave reception . It, also, uses the
new Philco High Efficiency self-centering glass tubes .
The circuit includes the Philco Foreign Tuning System-con-
trolled by the range switch-providing maximum sensitivity and
noise reduction when used with the New Philco High-Efficiency
Aerial, supplied with the receiver.
The red and black leads of the High-Efficiency Aerial "trans-
mission line" are connected to terminals 1 and 2 respectively , of
the terminal panel provided at the rear of the chassis . Connect
the jumper of the terminal panel across terminal 3 and 4. A good
ground connection is required in all installations. Make the
ground connection to terminal 3 on the terminal panel.
If a temporary aerial is used, the jumper should be across
terminal 2 and 3. The aerial connects to terminal 1 and the
ground to terminal 3.
CONSTRUCTION
The chassis is constructed in three basic assembly units.
The Radio Frequency unit contains a 6A8G tube which func-
tions as a Detector-Oscillator, tuning condenser, antenna and
oscillator coils for each tuning range, selector switch-compen-
sating condensers for all coils and other parts necessary for the
associated circuits . The unit is separately mounted on rubber
grommets, cushioning it from the main chassis.
· The .Intermediate Frequency unit, mounted on the right-hand
side of the chassis facing the front, consists of the Intermediate
Frequency coils, compensating condensers, a 6K7G tube for I. F.
Amplifier stage, and a 6Q7G tube as the second detector-auto-
matic volume control and first audio stage. All voltages surplied
to the I. F. and R. F. units are furnished from a termina strip
mounted in this unit .
The Power Pack and audio output circuits, together with the
required Voltage dividers and filter condensers are mounted in the
power unit. All high Voltage A. C. Wiring is housed in the power
transformer assembly which includes the rectifier socket.
Although unit construction has changed the appearance of
this model, the service bulletin will be of great assistance in
che::king through all stages of the receiver. The Wiring Diagram,
as usual, is numbered, indicating all important parts. These
numbers correspond with the parts layout shown in Fig. 6. In
addition, the range switch wafers are shown on the schematic
diagram. The contacts on each wafer are lettered and numbered
to indicate their connection points in the schematic diagram,
which are also lettered and numbered . The physical drawings
of each coil used in the receiver are also shown on schematic
diagram Fig. 5. The connections of these coils are numbered on
the coil itself and on the schematic diagram.
Fig. 1 shows the Voltage measurements taken from the bottom
of the socket at each contact . In Fig. 2, the correct position of
the dial indicator, for proper adjustment of the compensators
is shown. Figs . 3 and 4 show the location of the I. F. and R. F .
compensators respectively.
This receiver will be supplied in two model cabinets type B,
and F. These instructions, however, will cover both type
cabinets .
Electrical Description
'
Voltaite Ratinit: 115 Volts. A. C.
Frequency Rating: 50-60 Cycle.
For 25 to 40 cycle operation use Power Transformer, marked
with asterisks in Parts List .
Power Consumption: 60 Watts.
Type and Number of Philco Tubes: 1 type 6A8G First
Detector-oscillator ; 1 type 6K7G I. F. Amplifier; 1type 6Q7G
~~
f RECTIFIER '
i ~
i: .. . ----
(~~~.) VOLTAG£S N[ASURtD FRQM TU8[
1.--------------------------- CONTACTS TO CHASSIS.
Fig. 1-Socket Voltaites
Viewed from Underside of Chassis
2.... on.
1stAUDIO
175 ~ ~
Measurements taken with PHILCO MODEL 025 Circuit Test er which contains
a 1000 ohms per volt Voltmeter . Line voltage, IIS-Range Switch in Broadcast
Position . Dial tuned to 600 K. C.
2nd Detector, A. V. C., and 1st Audio; 1 type 6F6G Pentode
Output and 1 type 5Y4G, Rectifier .
Speaker: S7.
Type of Circuit: Superheterodyne with Pentode Power Output.
Intermediate Frequency: 470 K. C.
Undistorted Power Output: 3 Watts.
Tuning Ranites : Two-(1): 530 to 1720 K. C.; (2): 5.7 to 18.2
M.C.
POWER TRANSFORMER DATA
Lead No.
Shown A. C. Current Circuit Color Resist-
on Sche- Volts ance
matic
1-2 120 -Pri . White 5 ohms
3-4 5.0 2.0A Fil. Blue .1 ohm
Rect .
High 145 ohm
5-7 670 70 M.A. Voltage Yellow 155ohm
Sec.
6 -Center Yellow -
-Tap of 5-7 Green Tr .
8-9 6.7 2.1A Fil. Black .1 ohm
Copyright 1936, Philco Radi o & Televi son Corporation
philcoradio.com

PageZ PHILCO
Service Bulletin No. 246
6Q7G
2NO.DET.
lsr AUDIO
0 0@
oao
0 0
$7 @;;~~
(@SCREW·OSC.160QK.C.)
\(M)NUT-0SC.600 K.C.
~11------'--@ANT.
ob==~=T,~ISOOK.C.
@ANT. 18M.C.
Fig. 2-Dial Calibration Fig. 3-Locations of L F. Fig. 4-Locations of R. F.
Compensators
Top of Chaasis Compensators
Underside of Chassis
Ad.jutment of Compensators
The accurate adjustment of the various compensating con-
densers is vital to the proper functioning of this receiver. There
are four compensating condensers in the I. F. Circuit; three in the
Oscillator Circuit; and two in the Antenna Circuit. Incorrect
adjustment will cause loss of sensitivity, unsatisfactory tone, and
poor selectivity.
To accurately adjust this receiver, precision test equipment is
necessary. A signal generator such as the PHILCO MODEL
088 SIGNAL G.ENERATOR, covering from 110 to 20000 K. C.
is recommended to adjust the compensators at the various fre-
quencies specified. A visual indication of the receiver output is
also necessary to obtain correct adjustment of the compensators.
PHILCO MODEL 025 CIRCUIT TESTER contains a very
sensitive output meter and is recommended for these adjust-
ments.
Philco Fibre Wrench No. 3164 and Fibre Handle Screw-driver
No. 27-7059 complete the necessary equipment for these adjust-
ments. The locations of the various compensators are shown
in Figs . 3 and 4.
The following procedure must be observed in adjusting the
compensators: -
DIAL ADJUSTMENT-The Tuning Condenser is set at the
maximum capacity position, by turning the tuning knob counter-
clockwise. Loosen the set screw of dial hub and set dial, (see
Fig. 2) with Glowing Indicator centered between the index lines
at the low frequency end of scale.
OUTPUT METER-The Output Meter is connected to the
Plate and Cathode terminals of the (6F6G) tube and adjusted to
use the (0-30) Volt scale. When adjusting each circuit, care
should be taken to have the Signal Generator attenuator set to
give approximately ¼ scale reading on output meter.
INTERMEDIATE FREQUENCY CIRCUIT
1 Turn range switch to Range 1. Rotate the tuning control
to approximately 600 K. C. Connect the 088 Signal Generator
output lead through a .1 mfd. condenser to the grid of the
6A8G tube .
2 Set Signal Generator indicator for 470 K. C. adjust attenuator
for approximately ¼ scale reading on output meter. Then
adjust compenaators @a 2nd I. F . Sec., @ 2nd I. F. Pri., @a
1st I. F. Sec.,@ 1st I. F. Pri., for maximum reading on output
meter.
RADIO FREQUENCY CIRCUIT
Range 2.-5.7 to 18 M. C.
1 Remove the signal generator output lead and series condenser
from the 6A8G tube and connect them to the ANT. TERM-
INAL No. 1, on aerial input panel (rear of chassis) and the
generator ground lead to GND. TERMINAL No. 3, rear of
chassis. Connect TERMINAL No. 2 to GROUND TERM-
INAL No. 3 with connector link provided on the panel.
2 Set range switch in position No. 2 (S. W.). Turn signal gener-
ator and receiver dials to 18 M. C. and adjust compensator (7)
Osc. for maximum output.
3 The adjustment of the antenna compensator on the high fre-
quency range causes a slight detuning of the oscillator circuit.
In order to overcome this detuning ~effect, connect a variable
condenser of approximately 350 mfd., having a good vernier
drive, across the oscillator section of the tuning condenser ..
Leaving the signal generator and receiver dials at 18 M. C.,
tune the added condenser so that the second harmonic of the
receiver oscillator will beat against the signal from the signal
generator. The antenna compensator @a should then be
adjusted to give maximµm output.
4 Now remove the external condenser from the tuning condenser
of receiver and turn compensator (D osc. to the maximum
capacity position (clockwise), then without moving signal
generator or receiver tuning condenser, turn compensator CD
(counter-clockwise) until a second peak is reached on the
output meter . The first peak is caused by tuning to the imai;;e
frequency signal and must be neglected. Compensator CD1s
adjusted on the second peak to give maximum output.
RANGE 1: 530 to 1720 K. C.
Turn ,ange switch to Range No. 1. Turn the Receiver dial to
1600 K. C. Then adjust compensators @ and @ for maximum
reading on output meter .
The 088 Signal Generator dial is set at 800 K. C.and the second
harmonic of this frequency (1600 K. C.) is used in making the
above adjustment.
2 The low frequency end of the band is now tuned by turning
Signal Generator and Receiver dials to 600 K. C. and adjusting
compensator @a- see note (a) below- for maximum output.
(a) When compensator @a osc. series is being adjusted, the
Tuning Condenser must be rolled for maximum output.
This is accomplished as follows: First tune compensator
©a for maximum output. Then vary the Tunmg Con-
denser for maximum output at 600 K. C. Now retune
Compensator @a and again vary the tuning condenser
back and forth at 600 K. C., for maximum output. This
operation of first tuning the Compensator, then ~he Tu~ing
Condenser 'is continued until maximum output 1sobtained
at the 600 K. C. frequency .
3 Set the Signal Generator -and Receiver Dials for 1600 K. C. and
re-adjust Compensator ® for maximum output. Then turn
the dials to 1500 K. C. and re-adjust compensator ® for max-
imum reading on output meter.
-~
philcoradio.com

Page3
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PHILCO
Service Bulletin
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Of' CHASSIS. :- SOLID ARCA l/<0ICAT£ S REAR or SWITCH WAH P .
:- ~HADU> ARCA INDICATE ~ F'RONT or SWITCH WAl'ER .
:- ALL SWI TCH[$ SHOWN IN . BROAOCASTPOSITl()N.
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philcoradio.com

Page4
6 F6 GTU6
OUTPUT
PHILCO
Service Balletin
6 K7GTU6E
I.F.
No. Z46
Fig. 6-Base View of Chassis
Replacement Parts-Model 37-61
Schem . Deacrlptlon Part
No . No.
1 AntennaTrana. Broadcaat............... .. ... .. .. ..•.. .. . 32-2108
1 Antenna Tram. 8.W.... . .............. •. ;•.. .. .. ••. . .. . 32-2142
• Compem&tor
Twin Ant. 1600K.C.......• . . . .... . .. . .. ... 31-8093
• A Compem&torAnt. 18M.C•.. .. ...... . •..•......•. ..... Parl of©
• Condenler(Tul:>ular.06mfd.). .. .. .. . . ... .. .• .. . . .. . . .. . 30-#l4
• CondenaerSem1-lixed3600mfd. .... .. .... .•.•........... 31-l!103
• Tuning Condemer.... ..... . .......... ....•. • .•. ...... : . 31-1861
, CompeDB&torOoe., 18 M.C...... . ..... .. .. . .•. ... ..• .... 31-l!lOI
• CompeDl ■ tor O.c., 1600K.C. "Screw" .... .. ..•.... . ... . . . 31-l!lOO
• A CompeD11torOoe., 600K.C. "Nut " ....... . ............. Part of ©
• Tramformer 0.. . Broadcut .... . . .. .. .. .. .. .•. . .. . . .. .. . 32-2120
Trallaform11rO.c. S.W...... ... ............ . ............. 32-2143
Condemer(Tubular 250mfd.)....... .. .. .• ....... •...... 30-1032
I
Re,istor (32000ohma½ watt) .. .... .. .. .. .. .. .. .. .. .. .. . 33-332339
Re,istor (10000ohma½ watt) ...... .. .. .. .. .•.. .. .. •. .. . 33-310339
Compem&tor
(ht I.F: Pri. 470K.C.).. ... .. .. ..... ....... Part of 0
A CoT,Dl ■ tor (1st I.F. Sec.470K.C.).. . . ... . ........... Part of 0
.Ill I. . Tramformer... ..... . . .. .. .. . .. .. . . .•.. .. .. •. .. . 32-2100
Condemer (Tubular 0.1mfd.)..... ........ . ... . .... ..... 30-4170
Reei1tor
(I megohm½ watt) .... .. .•... •. •. .•. . .. .. .. .. . 33-310339
Reei1tor
(20000 ohm, I watt) .. .. . . .. . . . . . . . . . . . . . .. . . . . . 33-320439
Reeistor(9000 ohma,2 watt) .. .. .. .. ... . . .. .. .. .. . . .. .. . 33-290639
0 Electrolytic condemer,16mid.. ..... . . . .. .. .•. . .. .. •.... 30-2118
@ ·Reeiator(61000ohma1 watt1...... ......... .. .. . .. . ..... 33~1439
0 VolumeControl.... ..................... •.. •........... 33-3167
§CondeDBer(110mmfd. Mica).. ... .. . ...... . ............. 30-1031
Condemer(110mmfd. Mica).... ... . ........• .. . . ... . ... 30-1031
Resistor(61000ohma½watt) ..... .. . ..... . •. . ... . .•.. . . 33-361339
0 Compem&tor(2nd I.F.l'ri.)470 K.C... . . .. •. . .. .. .. •. . . . Part of@
@A Com~tor (2nd I.F. Sec.) 470K.C.. ....... .•.. .. .. .. . Part of@
0 2nd I. . Tramformer..... . . .. .. ... .. .. .. .. •. .•. . .. .. .. . 32-2102
0 Conden1er(110mmfd. Mica)........ . .. .... . . .•. . .. ..... 30-1031
0 Condemer(.016mfd.Tubular)......•.•. . .. . .•... . ...... 30-4368
0 Reei,tor (I megohm½ watt). ... .. .. .. . .. .... .. .. .. .. .. . 33-310339
0 Condenaer(0.1mfd. Tubular).... . .. ..... . .. . .. . .. .. .... 30-4122
0 Reeistor(1.0 megohm½ watt) .... ... .. .. .. .. .. .. . .. .. . . . 33-310339
§Reeiator(490,000ohm ½ watt).... .. .. ... .. •. .•.. .. .. .. . 33-449339
Reeistor
(70000ohm ½ watt).. ...... •. .. .. ... .. .. .. .. .. . 33-370339
Condenaer(.016mfd: Tubular)... . ... •. .. .. .. . . .•. . ..... 30-4226
0 Re,istor ~l megohm½ watt)...... .. ... . .... .. . ... . . . ... 33-610339
@ Field Cci Aasembly.... . . .. .. . . .. .. . . . .. . . ••.• .. .. .. .. . 36-3039
0 Output Tranaformer...... .. . . .. .. ... .. .. .. .. .. .. .. .. . . . 32-7019
0 Coneand Voice Coil Asaembly......... ... .. . . ..• . .. .. ... 31>-3167
@ Condenaer(.03 mfd. Tubular).... . .. . . .. . .. .. .. .. .. .. .. . 30-4380
@ Condenaer(.008 mfd. Tubular)................. .. ....... 30-4112
0 ElectrolyticCondenaer(8 mfd.)..... , .. .. .. . . . .. .•.. .. .. . 30-2024
§BiasResistor(246ohm). .. ...... .... .. . . ..... .. .. .. .. .. . 33-3277
ElectrolyticCondemer 12mfd.. .. .. .. .. .. .. . . .. . . .. .. .. . 30-2117
PowerTransformer(60-60 cycleIOl>-120volt).... . •. . ..... 32-7683
•Power Tranaformer(26 cycle116volt)....... .... ......... 32-7684
§CondenaerBakelite Twin (.Oll>-.016mfd.).. .... .. .•.. .. . . . 3793DO
ToneControl& ACSwitch.. .. ..... ... . . . .... ... . ....... 42-1180
Pilot Lamp.. ..... . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .• .. . . . 34-2039
Price
Llat
$0.80
.60
.40
.20
.60
3.26
.20
.40
.66
.60
.26
.20
.20
1.60
.26
.20
.20
.30
1.66
.20
1.00
.20
.20
.20
1.60
.20
.20
.20
.20
.20
.20
.20
.20
.20
2.76
.86
.80
.20
.20
1.10
.20
1.20
4.26
.40
.76
.16
Schem. Deacrlptlon Part
No. No.
0 WaveSwitchAsaembly........... ... ... ..... •.. . ... ... . 42-1196
Price
Llat
$1.60
Dial... ... . ...... :....... ... . .. . ..•.. .. ..•......... .. . 27-6206
Dial Hub.. . . . .. .. ..................... . . .. .. .. ...... . 28-7162FA-3 .10
DialHub Clamp......... . ........ ... . ...... .. .. ....... 28-2837FA-3 .10
Set Scnw....... .... ....... .......... ........ .. ...... . N-UiOG Per C 2.00
ScreenBracket & Scn,enAsaembly... . .. .... ... . ........ . 31-1878 .26
Pilot Lamp SocketAaembly. . .. .. . . .. ... .. .. .. .. . . .. .. . 28-770II .16
Tube Socket(7-prong)....... . .... .. ... .. .. .. •. ... . .. ... 27-6067 .11
Tube Socket(S-prong)... .......... . ... • ... . . .. .•....... 27-6068 .11
Tube Shield... .. .. . .. .... .. .. .. .. .•.. .. •. ••.. . . .. .. .. . 28-2726 .10
Tube ShieldBue. ........ .... .. .. .. .. .. .. .. .. .. .... .. . 28-3898 .08
1.F. CoilShield..... ......... . .... .. ... . .... ... ........ 38-7763 .110
R.F. Tra111formerMlg. Plate..... .. .. .. . . .. .. .... .. .. .. . 28-3808 .02
R.F. Tramlormer Mtg. Spacer.......• . .•.....•.. •..... . . 27-8228 .01
R.F. Tramlormer Mtg. Screw. ..... .. ... ........ . ....... W-1636 Per C .30
R.F. Unit Mt.g. Grommet..... .. .. .. .. .. .. .. . . .. .. .. .. .. . 27-4317 .04
R.F. Unit Mtg. Sleeve. .. .......... .. .. ..... ... ......... 28-2257FA-3 .01
~wu~ _it.~~ --~~her ..'.'.': : :::: :: :: :: :: :: :: :: :: :: :: :: : ;j:}A-3 Pere .26
Tuning CondeDBerMt,:. Grommet.. ...... .. .. .. . .. .. .. .. . 27-4326 .02
Tuning CondemerMtg. Screw.. ........ ......... . ....... W-660FA-3 Per C .40
B.C. ReeiatorMtg. Screw................... . ........... W-312 Per C .90
B.C. ReeiiltorMt«. Nut....... . .. .. .. .• .• . . ..•. .•....... W-317A Per C .40
VolumeControlSliaft..... .......... ...•.. ..•. .. ....... 28-M98 .10
VolumeControlShalt Wuher ....... .. ... .. .. ........... 28-4186
VolumeControlShaft Wuher .............. .. ....... . ... 4436
Volume ControlShaft Spring.... . .. .. .. .. .. .. .. . •.. .. . . . 28-4117
VolumeControlShalt RetainingClip.. .... .. . . .. .. .. .. .. . 2S-8610
Volume Control Mtg. Nut ............ . ... . ...... . .. ..... W-684FA-3
Tone Control Mt,:. Nut ... .... .. . .... . ...... .. ........ .. W-684FA-3
ToneControl rnsulator.. .. .. .. .. .. . . .. .•.. .. . . •. .. .. . . . 27-8320
I.F. TerminalPanel .. ......... , ......• . ...... . ..• ..... 3S-77o;I
Per C 1.60
Per C ·'°
.oa
Per C 1.26
Per C 1.26
Per C .40
.26
VernierTuning Assembly.. ............ ,. ... . . . .. .. ..... 31-18711
iFntr T\mir~ ScreWI.... ...... . ....... . ........ ....... ~! FA-3 p C .26
i:~~~~:v::;_:_:_:_:.::::::::::::::::>::::::::::::~i::~ er ::g
Knob Volume, Tone Controla... ... , .... . ......... ....... 27-4332 .10
Knob Wave-Switch..... . ......... . .•.. .. •. ... . ....•.... 27-4332 .10
ChassisMt.g. Screw........... ......... .. .. ... . .. . . .... .
Baffle
AsaemblyB cabinet ....... . •. .. .. .. .. .. .. . . .. •. .. . 40-6936
BaffleAsaemblyF Cabinet............. ... . . . .. . . .., . .. . 40-6933
A.C. Cord.. ..... . . .. . . .. . . .. . .. .. .. ... •.. .. .. .. .. .. .. . L-2183 .40
Speaker Cable... . . .. . . .. . . .. .. .. .. .. . .. . . .. . . .. . .•. . . . L-2181 .26
ClampElectrolyticCondeDBer.. . . .. .. .. .. •. .• .. . .•. .. .. . 6440 .06
Insulator ElectrolyticCondeDBer.... .. ..•. •• .. .. .. •. .. . . . 27-7194 .01
Grid Cap.. .. ..... . . .. .. .. .. .. .. .. .. .. .. .. .. .. . .. .•. .. . 38-3888 .01
SpacerCompenaatingCondeDBer.... .. .. .. .. ••. . .. .. .. .. . 29-6032 .04
~i~~/~ : ::_:_:_:_:_::.:>::::::::::::::::::::::::::::i!~FA-3 ::~ a:il
ScrewSpeaker:;;f1g.............. . ........ . .. .. ..... . ... W-1604 Per C .60
Bottom ShieldPlate (F Cabinet)....... . . .. .•... .. .. .. .. . 28-38116FA-3
•PowerTransformerusedin Model37-61A Prlcea Subject to Chanae Without Notice
PHILCO
May, 1936 Parts and Service Division Printed in U.S.A.
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