Philco 37-650 User manual

• • • • • • • • • • • • • • 'mDdll.l37-650
FOR MEMBERSOF
RADIOMANUFACTURERSSERVICE SERVICEBULLETIN
No.154
SERVICE DATA
DESCRIPTION
Model 37-650 is an 8 tube superheterodyne receiver for operation
on alternating current. It has three tuning ranges, covering standard
broadcast and short-wave frequencies. The chassis is constructed in
four basic assembly units, concentrating the R. F., I. F., Audio and
Powe·r Circuits in individl!al units .
The circl!it includes the Philco Foreign Tuning System-con-
trolled by the range switch-providing maximum sensitivity and
noise reduction, when used with the Philco High Efficiency Aerial;
one stage of radio frequency amplification before the Detector-
Oscillator tube; Automatic Bass Compensation in the Volume Con-
trol Circuit; Shadow Tuning; Automatic Volume Control, and a
Push-Pull Pentode Output Circuit.
AERIAL CONNECTIONS
The red and black leads of the High-Effidency Aerial "transmission
line" are connected to terminals 1 and 2 respectively, of the terminal
panel provided at the rear of the chas~is. Connect the jumper on
the terminal panel across terminals 3 and 4.
If a temporary aerial is used, the jumper should be across terminals
2 and 3. The aerial conne..:ts to terminal 1 and the ground lead to
terminal 3. A good ground connection is desirable in all installations.
REPLACING DIAL
To replace the dial, remove the clamp holding the dial to the hub
by turning clamp counter-clockwise, using the two holes provided on
the clamp for this purpose.
REMOVING MASK ARM & LINK ASSEMBLY
First remove dial, then loosen set screw of dial hub and remove
the hub and felt washer from the shaft. Now loosen screws holding
indicator bracket and lens assembly, and move bracket forward about
½ inch. The assembly may now be removed by loosening set screw
of rangt switch arm, then pull arm off of range switch shaft.
REMOVING SWITCH & COIL ASSEMBLIES OF R. F. UNIT
To replace any part in the switch and coil assemblies of the R. F.
Unit, each assembly can be removed separately as follows:
First remove the tuning dial, mask and arm assembly. Remove
the center mounting screw on the rear of the R. F. Unit . Then lift
the rear of the unit and push forward until the rubber mounting
grommets, on each side of the unit, clear the mounting slots. The
unit is then lifted far enough from the chassis for removal of the two
screws holding the selector switch indexing plate anrl shaft (front of
unit). Then pull shaft straight out from the unit. Also, remove the
volume control shaft by releasing the retaining clip, inside the
chassis, from the shaft.
IMPORTANT -W hen selector switch shaft is replaced, care
should be taken to have all wafer rotors in the same position, so that
the key on the sw~tch shaft will slide freely into the notched hole in
each wafer rotor . NEVER force shaft into rotors.
Servicing Stages - It is necessary to unsolder some connecting
leads in order to release the stage for servicing. If all the following
connections are unfastened the stage will be entirely released.
Ordinarily only one or two leads need be loosened in order to change
coils, replace coupling condensers, or replace switch sections.
Antenna Stage Assembly:....Rear Section of Unit
A. Remove screw holding shield plate to the unit base . This
screw is located in the right hand corner of the shield plate, facing
rear underside of the chassis.
B. Unsolder the wires at the I. F. and Aerial terminal panels which
connect to the range switch, also wires from tunin g condenser
housing to tubular condenser (6); tuning condenser stator plate to
selector switch contact (B3), anrl ground lead from assembly shield to
unit frame. After disconnecting these wires assembly may be removed.
R. F. Stage Assembly-Middle Section
A. Remove screw (right side of assembly) holding shield plate to
unit ba~ .
B. Unsolder the two wires connecting the I. F. Unit to range
switch contacts (C3) and (D12); also wires connecting tuning con-
denser housing to tubular condenser @ and stator plates to selector
switch contact (D3); selector switch contact (D2) to the grid of the
6A8G tube, and ground lead from shield to unit frame. Remove
assembly from the unit.
Oscillator Stage Assembly-Fi:ont Section
A. The oscillator assembly may be removed by unscrewing the
four screws holding shield to R. F . base. These screws are located
on each side of the R. F. Unit.
B. Unsolder the wires connecting range switch contacts (E2) and
(F2) to the 6A8G socket; tuning condenser stator plates to range
switch contact (F3) ; mica condenser @ to the tun;ng condenser
housing; range switch to resistor @)and ®, and ground lead to I. F.
Unit. With these leads disconnect unit may be removed.
Replace the units by following the above procedure in the reverse
order. Electrical Specifications
Power Supply: Voltage
115
115
Frequency Cycles
50-60
25-40
Consumption
110 watts
110 watts
Intermediate Frequency: 470 K. C.
Output: Undistorted 7 watts.
Philco Tubes: 6K7G-R . F . Amplifier; 6A8G--Oscillator and first
detector; 6K7G-I. F. Amplifier; 6J5G-2nd Detector, A. V. C.;
6K5G-lst Audio ; 2-6F6G - Output; 5Y4G-Rectifier.
Tuning Ranges: Range 1- -530 to 1720 K. C.; Range 2-5.7 to
11.6 M. C.; Range 3-11.5 to 18.2 M. C.
Speakers: X Cabinet-H-26; B Cabinet-K-35 .
POWER TRANSFORMER DATA
Schematic A.C.
Leid No. Volta
1-2 120
34 5.
5-7 700
6 -
8-9 6.7
'
r
'-----······-········--·-------..
CLWrent
-
2.0A
135MA
-
3.3 A
Circuit Color
Pri. White
Rect. Fil. Blue
High Volt.
Sec. Yellow
Center Tap Yellow
6-7 Green tr.
Fil. Black
rRONT OF CHA SSIS
DEt-OSC.
6Aas a~ I
OSC.PUT[150V. ~o~
0SC. G~ 90.:
!DOV.-~ 1 V.
VOLTAG[S MUS.UR[D ~ROM SOCKlT
CQNHCTSTO (i:RQUNO.
•.3V.·A.C.
R111ttance
2.0 ohm
Lessthan 0.1 ohm
55 ohms
60 ohms
-
Leasthan 0.1 ohm
.3V.·A.C.
I.F.AMP. b.3H.
6K1G·~
--c~~~A)
s"l'r.~O~
~
100V. 150~
2No.DET.-A.V.C.
6JSG
b.3H ..C.
1sr.AUDI0
6K5G
Fill,. 1-&cket Voltall,ea-Underaide of Chaaal1 View
The v.:,ltages indicated by arrows were measured with a Philco 025 Circuit
Teater which contains a voltmeter having a reeistance of 1000 ohms per volt .
Volume Control at minimum, range switch in broadcast pvsi~ion, line voltage
115 A. C.
Copyright 1936, Philco Radio & Television Corporation
philcoradio.com

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Fig. 2-Schematic Diagram
Model 37-650
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No. Z54 PHILCO Service Bulletin Page3
Fig . 3- Base View
Replacement Parts-Model 37-650
Schem.
No. Part
Description No.
1
2
3
4
5
6
7
8
9
10
Ant. Transform er (Broadcaa t) . 32-2108
Ant. Traneforme r. . . . . . . . 32-2150
Ant. Transformer (S. W.). ....... 32--2175
Compensator Ant. (Five sections). 31-6104
Tunin g Condenser... 31-1855
Condenser (.05 mfd. tubular) ..... 30-4020
Resistor (51000 ohms, ½watt) ... 33-351339
Condenser (40 mmfd. mica). . .. .. 30-1076
R. F . Tran sformer (Broadcaat) ... 32-2105
Compensator (R . F.) (Five sec-
tions) . . . . . . . . . . 31-6110
11 R. F.Trr.nsformer .......... . .... 32-2151
12 R . F. Transformer (S. W.)... 32-2176
13 Condenser (.05 mfd. tubular) 30-4020
14 Condenser (.1 mfd. tubular) .. 30-4170
15 Condenser (.05 mfd. tubular) ... .. 30-4123
16 Compensator Osc. (Six sections)... 31-6111
·17 Osc. Transformer (Broadca st). 32-2120
18 Osc. Transform er ... .......... 32-2152
19 Condenser (.003 mfd. mica) . .. 30-1028
20 Osc. Transform er (S. W.)........ 32-2182
21 Resistor (10000 ohms, ½ watt).. 33-310339
22 Condenser (250 mmfd. mica ). . . 30-1032
23 Resistor (32000 ohms. ½ watt) ... 33-332339
24 Electrolyti c Condenser (16 mfd. ).. 30-2118
25 Condenser(.! mfd. tubular) ...... 30-4170
26 1st I. F. Tran sformer & Compen -
sators..... . .. ..... 32-2169
27 Shadow meter . . .. . . . . . . . .. . . . . . 4-5-2189
28 2nd I. F. Tran sforme r & Compcn-
eators 32-2171
29 Condenser (110 mmfd. mica ) ..... 30-1031
30 Condenser (110 mmfd . double
bakelite) .. . ......... . ........ 8035-DG
31 Resistor (240000 ohms, ½ watt ) .. 33-424339
32 Resistor (240000 ohms , ½ wat t) .. 33-424339
33 Condenser (.01 mfd. tubular) ... .. 30-4124
34 Resistor (I megohm ,½ watt) .. 33-510339
35 Resistor (I mc,o hm. ½watt) ..... 33-510339
36 Resistor (190000 ohms,·½ watt) .. 33-449339
37 Condenser (.1 mfd . bakelite) ...... 4gs9-SG
38 Resistor (I megohm, ½ watt). 33-510339
39 Volume Control .............. 33-5158
40 Condenser (.i5 mmfd . mica )... 30-1053
41 Re@istor (40000 ohms,½ watt). 33-340339
42 Condenser (.006 mfd. tubular) . ... 30-4125
43 Condenser (.015 mfd. tubular )... 30-4358
44 Resistor (99000, ½watt)....... 33--39933~
45 Condenser (.03 mfd . bakrlite) ..... 8318-SU
46 Resistor (330000 ohms, ½ watt). 33-433339
47 Condenser (.01 mfd. tubular) ..... 30-4169
48 Condenser (.003 mfd. tubular) .... 30-4469
Price
List
so.so
.80
.80
4.50
.20
.20
.20
75
.60
.70
.20
.25
.20
.65
.75
.45
.70
.20
.25
.20
1.65
.?.5
2.50
.20
.25
.20
.20
.20
.20
.20
.20
.35
.20
1.00
.20
.20
.20
.20
.20
.35
.20
.20
.20
fi11Uf81in black typeIndicatecircled figuresin Base View.
Schem.
No. Part
Description No.
49
50 Output Tran sformer K35-H26 . 32-7634
Cone and Voice Ceil K35 . .. 36-3174
Ccne and Voice Coil H26 .. ... 02625
51 Condenser (.003 mfd. tubular)... 30-4469
52 Resistor (3500 ohms, ½ watt). 33-235339
63 Resistor (490000 ohms,½ watt ) .. 33-449339
54 Condenser (.05 mfd., .03 mfd.
bakelite)................... 3615-YU
55 Resistor (1 megohm, ½watt) .. 33-510339
58 Field CoilK35-H26. . . . . . . . .. . 36-3687
57 Electrolytic Condenser 8.0 mfr!.. 30-2024
58 Bias Resistor. . . . . . . . . . . . . . . . . 33-3280
59 Electrolytic Condenser (10, 20
mfd. )........................ 30-2163
60 Resistor (10000 ohms, 2 watt ). . . 33-310539
61 Resistor (9000 ohms , 2 watt).. 33-290539
62 Resistor (25000 ohms , 1 watt.) .... 33--325339
63 Power Transformer 115 V., 50-60
cycles ....................... 32-7606
Power Tran sformer 115 V., 25-40
cycles . . .. . . . . . . . . . . .. .. . . 32-7607
64 Tone Contro: & A. C. Switch ..... 42-1184
65 Condenser (.015 mfd. double
bakelit e).. 3793-DG
66 Pilot Lamp ........ 34-2039
67 Range Switch Ant..... 42-ll89
68 Range $witch R. F... 42-ll90
69 Ran~e Switch Osc. ... ........... 42-1191
Selecto r Switch Ind exing Plat e &
Shaft.. 42-1192
Dial... . . . 27-5248
Dial Hub ... . 28-7187
Dial Clamp. 28-2837
Set Screw......... W-1641
Retaining Washer... 4436
Gear (Dial) .. . .. . . . . . • . . . 28-7185
Gear Drive.... 31-1884
Thrust Spr ing... .. . . . . .. . . •. 28-8611
Thru st Washer.. 28-3976
C Washer .. . 28-3904
Scale Guard...... . . . .......... 27-8324
Indicator Brkt. & Lens Assembly .. 38-7912
Pilot Lamp. .... . . . . . . 34-2039
Pilot Lamp Assembly. 38-7706
Mask...... ..... ...... .... 27-5198
Mask Arm & Link Assembly. 31-1866
Ma sk Guide... 38-7844
Mask Wash er ... 27-8318
Socket 8 prong. .. . . . . . . . . . . . 27-6058
Socket 7 prong. 27-6057
Socket, Rect. . .... 27-6052
Tube Shield Base. . . . . . .... . 28-3898
Price
List
U.50
.80
1.20
.20
.20
.20
1.10
.30
.20
75
.40
.15
1.25
1.25
1.25
.50
.40
.12
.10
.02
Per C 1.50
10
.25
.01
Per C .30
.01
.30
.15
.35
.30
.35
Per C .50
.11
.11
.03
Price Subject to Chan ge without Notic e
Schem. Part Price
ListNo. Description No.
Tube Shield. . . . . . 28-2726
Terminal Pan el Assembly I. F.. . 38-6306
Terminal Panel Antenna. 38-7714
Grommet Mtg. R. F. Unit.... 27-4317
Sleeve Mtg. R. F. Unit.. 28-22-57
Screw Mt g. R F. Unit . W-729
Washer Mtg. R. F. Unit . . . . .. 28-3927
Washer Felt R. F. Unit........... 27-7807
Grommet Mt g. Tunin g Condenser. 27-4325
Shadowmete r Lamp Shield. . ..... 28-2917
Mtg. Plate R. F. Tran sformer .... 28-3808
Mt g. Soacer R. F. Transformer.. 27-8228
Mt g. Screw R. F. Transformer.. W-1635
Shaft Volume Control. 38-8060
Clip Retaining .... .. 28-4394
Sprin g.. .. . . . . 28-4117
Cable S;,eake r . 41-3202
Cord A. C. .. . .................. L-2183
Insulator Electrolytic Condenser .. 27-7194
Verni{':rDrive Tuning Condenser.. .
I. F. Shield ..................... 38•7~84
Rhadowm•tc r Mtg. Spring.. . . . 28-8623
Knob Tuning ........ . 27-4330
Knob Tuning Vernier.. .. 27-4331
Knob Tone·Volume.. 27-4332
Knob Range Switch.. . . . . . . . 27-4326
Terminal Cover Speaker. . . 36-3672
Speake r K--35.. . .... . "B" CABINET
36-1231
Screw Chass is Mtg............ . . .
Washer Chassis Mt g........ ·~· .. .
Be1.el Frame & Plate Assembly .. .
Glass .. .
28-2089
40-5945
27-8299
Ring ..... . ..... 28-3987
G•sket-. .. 27-8312
"X" CABINET
Speaker H-26.. .. .............. 36-1238
Bezel Frame & Plate Assembly.. 40-3937
Glass .. 27-8300
Ring.. .. . ~~im
G,sket . .
Screws \Y-1644
Bottom Shield Plate.. 28-4031
Snap Fastener ........ 2,,8:4
12
6~_
1~
Screw Speake r Mtg.. " 0,
Nut .... W-124
Washer.............. W-291
Screw (Chas,is Mtg. ).... \\'-14 95
Rubb er (Chass is ~tg.l. 3558
\Va.her.......... ..... 29-2089
$0.10
.03
.15
.04
.01
Per C .45
.01
Per C .40
.02
.02
.02
.01
Per C .30
.12
.03
Per C .40
.40
.OJ
Per C .70
.10
.10
.10
.10
7.25
Per C .30
.06
.40
.01
8.25
.06
.45
.01
Per C .50
.45
Per C .35
Per C .40
Per C .40
philcoradio.com

Page4 PHILCO Parts and Service Division No. 214
GLOWINGBEAMINDICATOR
lST.AUDIO
6K5G
0
0
ho.DET.
A.v.c.
6J5G
10 @0SC.-18M.C.II
@OSC.-12M.C.I
FIil. 4- Dlal Calibration FIil. 5-1. F. Compenaators -T op of Chassis FIil. 6-R. F. Compenaatora-Underslde of Chassis
Alignment of Compensators
The accurate adjustment of the various compensating condensers is vital to the
proper functioning of-this receiver . There are four compen~ating condensers in th e
I. F. Circuit, six in the Oscillator Circuit, five in the R . F. Amplifier Circuit and
five in the Antenna Circuit . Incorrect adjustment will cause loss of sensitivity,
unsat is~actory tone, and l)<>Orselectivity .
To accurately adjust this receiver, precision test equipment is necessary. A
signal generator such as the PHILCO MODEL 088 SIGNAL GENERATOR,
covering from I10 to 20,000 K. C. is recommended to adjust the compensators at
the various frequencies specified. A visual indication of the receiver output is also
necessary to obta in correct adjustment of th e compensators. PHILCO MODEL
025 CIRCUIT TESTER contains a sensitive output meter and is recomm ended
for these adjustments.
Philco Fibre Handle Screw-driver No . 27-7059 completes the necessary equip-
ment for these adjustments. The locatio ns of the various compensators are
shown in Figs. 5 and 6.
The following procedure must be observed in adjus ting the compensators :-
SHADOWMETER ADJUSTMENT
I . Remove the aerial and allow tub es to warm up . Then adjust shadowmeter
a, follows: Move the coil back ward and forward until oppos ite edges of the shadow
are ¾ of an inch from each end of shadow screen, measuring along bottom edge .
Adjustment of the shadowmeter light bracket may be necessa ry for perfect centering.
2. Rem ove the (5Y4G) rectifier tube from its socket and rotate coil until shadow
reaches minimum width . This width is not to exceed •,.,•.
3. Replace the (5Y4G) rectifier tube. Shad ow mu st not widen to mor e than
¼" or less than 1
,{." from each side of screen . If the se limits are not obtained
readjust the shadowmeter as given in paragraphs I and 2 until the y are reached .
OUTPUT METER - The 025 Output Meter is connected to the plate and
cathode terminals of one of the (6F6G) tubes . Adjust the meter to use the (0-30)
volt scale .
DIAL CALIBRATION-Rotate the tuning condenser control to the extrem e
counter-cl ockwise position (maximl!m capacity) . Loosen th e screw of dial hub,
then turn dial until the glowing indicator is centered on the second index line of
dial scale (see Fig . 4). Then tighten the dial hub set screw in thi s position.
INTERMEDIATE FREQUENCY CIRCUIT
Frequency 470 K. C.
I . Turn volume contr ol to maximum volume position. Connect the 088 Signal
Generator output through a .I mf<I. condenser, to the control grid of the 6A8G
tube and the ground connection of the output lead to the chass is.
2. Set th e range switch in position No . 1 (Broadcas t ), th en rotate the tuning
condenser of t he receiver to the maximum capacity position (coun ter-clockw :se)
and adjust the signa l generator for 470 K. C.
3. Adjust compensators (28S) 2nd I. F. Sec., (28P) 2nd I. F. Pri., (26S) 1st I. F.
Sec. and (26P) 1st I. F . Pri. for maximum readin g on the out pu t mete r.
. RADIO FREQUENCY CIRCUIT
Tunln!l Ranlle-7.3 to .18.0 M. C.
I. Rem ove the signal generator output lead from th e grid of the 6A8G tube and
connect it through the .1 mfd . condenser to termin al No. l on aerial input panel and
the a;enerator ground lead to terminal No. 3, rear of chassis. Terminals 2 and 3
mus tl be connec ted with the shorting link provided on the panel during the se
adjustments .
2. Set the range switch in position IS"o. 3. Turn the receiver and signa l generator
dials to 18 M. C. Now adjust compensator (16D) by turning the screw (clock-
PHILCO
wise) to the maximum capacity position. Then slowly turn it counter -clockwise
until a second peak signal is reached on the output meter . The first peak from
maximum capacity-is the image signal and must not be used . NOTE: In some cases
only one peak will be found, therefore, tune the compensator to this peak . If the
above procedure is correctly performed, the image signal will be found at 17.060
M. C., by advancing signal generator input and turning receiver dial to this fre-
quen cy mark on the dial.
3. The antenna and R. F . compensat ors (4C) and (IOC) are now adjusterl by
connecting a variable condenser of approximately 350 mmfd .,-having a good
vernier drive-across the oscillator compensator (16D) contact (first contact from
left •ide of receiver facing rear underside view of chassis) and ground. Leaving
the signa l generator and receiver dials at 18 M . C., tune the added condenser until
the second harmonic of the receiver oscillator beats against the signal from the
generat or, th ereby giving an indication on the output meter . It may be necessary
to increase the signal generator output to obtain a signal of sufficient strength for
reading on the output meter . Th e antenna and R. F . compensators (4C) and
(IOC) should then be adjusted for maximum output. Then remove external
condenser and readjust compensator (16D) as given in paragraph 2 above .
4. Turn signal generator and receiver dials to 12 M. C. and adjust compensators
(16E), (I0 D), (4D) for maximum output.
5. Now tum signal generator and receiver dials to 18 M. C. and readjust com-
pensators (16D), (IOC) and (4C) as given in Paragraphs 2 and 3 above .
Tunlnll Ranlle-5.7 to 11.6
I. Set range switch in position No . 2. Rotate signal generator and receiver dials
to II M . C. Compensator (16B) is now adjusted as given in Paragraph 2, under
tuning range 7.3 to 18 M . C . above. Check image signal on the 10.06 dial mark .
The only difference in the two procedures is the frequency used .
2. Turn the signal generator to II M . C. Then connect a 350 mmfd . variable
condenser from the oscillator compensator (16B) contact (third contact from left
side of the receiver, facing rear underside view of chassis) and ground. Tune the
added condenser, as given in Paragraph 3 under tuning range 7.3 to 18 M . C. Now
adjust compensators (IOA) and (4A) for maximum output . The only difference
in the two procedures is in the connection of the variable .,:::ondenserand the
frequency used.
3. Readjust compensator (16B) as given in Paragraph I for maximum output .
4. Turn signal generator and receiver dials to 6 M. C. and adjust compensators
(16C), (10B) and (4B) for ma.ximum output.
5. After the 6 M. C. end of scale is adjusted, the high frequency end is read justed
as given in Paragraphs I, 2 and 3 above .
Tunlnll Ranlle-530 to 1720 K. C.
I. Turn signal generator and receiver dial s to 1600 K. C.-If signal generator
scale is not calibrated for 1600 K. C. the dial of the generator may be rotated to
800 K. C. and the second harmonic of this frequency (1600 K . C.) may be used for
following adjustments. Compensat ors (16), (10) and (4) are now ad ju sted for
maximum output.
2. Turn signal generator and receive r dials t o 580 K. C. and adjust cr,mpen sator
(16A) for maximu m output . This is accomplished as follows:
First tune compensator (16A) for max imum output. Then vary the tuning
condenser for maximum output about the 580 K . C. scale mark . Now retune
compensato r (16A), and agai n vary the tunin i: condenser back and forth about 580
K. C. for maximum output. This operation of first tuning the compensator, then
the tuning condenser is continued until maximum output is obtain ed on or abou t
th e 580 K . C. dial mark .
3. Turn signal generator and receive r dials to 1600 K. C. and readju st com-
pensator (16) for maximum output.
4. Now rotate sig~al generator and 1eceiver dials t" 1500 K. C. and adjust
compensators (10) and (4) for maxim um output.
SaveTime
andTrouble
on all
ServiceJobs
July , 1936 YOUR DISTRIBUTORCAN SUPPLYYOU Printed in C.S.A.
-·-,:
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