Philco 37-670 User manual

-----..,.__
• • • • • • • • • • • • • • 'm,,d,d, J7-670
FOR MEMBERSOF
RADIOMANUFACTURERS
SERVICE SERVICEBULLETIN
No.160
SERVICE DATA
Model 37-670 is an 11 tube superheterodyne receiver designed for
operation on alternating current. It has five tuning ranges, covering
standard broadcast and short-wave frequencies. The chassis is con-
structed in four basic assembly units, concentrating the R.F ., I.F.,
Audio and Power circuits in individual units .
The circuit 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;
automatic bass compensation in the volume control circuit; shadow
tuning; automatic volume control, and a push-pull class "A" out-
put circuit. AERIAL CONNECTIONS
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 on the rear of the chassis. Connect the
jumper on the terminal panel across terminals 3 and 4.
If a temporary aerial is used, the jumper should be across term-
inals 2 and 3. The aerial connects to terminal 1 and the ground lead
to terminal 3. Agood ground connection isdesirable in all installations.
REPLACING DIAL
To replace the dial, remove the clamp holding the dial to the hub,
by tummg clamp counter-clockwise, usmg 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 range switch.arm, then pulling 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 and 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-When selector switch shaft is replaced, care
should be taken to have all wafer rotors in the same position, so that
the key on the switch 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 ASSEMBLY-Rear Section
1. Unsolder the wires which connect the antenna panel and I.F .
Unit to the range switch, also the assembly shield ground leads.
2. Unsolder the two leads from the gang condenser terminal panel
which connect to the range switch. Also the lead of tubular con-
denser (40) at the ground lug on the R.F. Unit .
3. Remove the screw holding the shield plate to the unit base.
This screw is located in the right hand comer of the shield plate,
facing the rear underside of the chassis. The assembly can then
be removed . R.F. ASSEMBLY-Middle Section
l . .Unsolder the wires from the I.F. Unit and the 6K7G plate
contact in R.F. Unit which connect to the range switch. Then
remove ground leads of shield plate.
2. Unsolder the leads from the gang condenser terminal panels
and the lead connecting D2 on the range switch to the 6K7G Plate
Contact .
3. Remove the screw holding the shield plate to the unit base.
This screw is located in the right hand comer of the shield plate
facing the rear underside of the chassis. Then pull the assembly
straight 'out.
OSCILLATOR ASSEMBLY-Front Section
1. Unscrew the two screws located on each side of the R.F. Unit.
2. Unsolder the wires connecting the range switch to resiston
(81) and (78) in the power unit, electrolytic condenser (77) in the
R.F. Unit and Osc. plate and grid contacts on the 6A8G socket.
3. Remove the leads from the gang condenser terminal panels and
the lead of Mica condenser (30) at the ground lu~ on R.F. Unit base.
With these leads disconnected lift oscillator section from unit.
Electrical Specifications
POWER SUPPLY:
Voltage
115
115
220
Frequency
50-60
25-40
Power Consumption
130 watts
130 watts
Power transformers for the different voltage and frequency ratings are listed In
the Parts List. pqe 3.
Intermediate Frequency : 470 K. C.
Audio Output: 10 watts
Philco Tubee Used: 6K7G, R.F . Amplifier; 6A8G, Oscillator and First Detector;
6K7G, I.F . Amplifier; 6J5G , 2nd Detector, A.V.C.; 6J5G, First Audio; 6JSG,
Phase Inverter; 2-6J5G, Push-Pull Driven; 2-6F6G, Output; 5X4G, Rectifier .
Tunlnll Ran11ee: Five. Range 1-530-1600 K. C.; Ranse 2-1.58 to 4.75 M. C.;
Range 3-4 .7 to 7.4 M. C.; Ranae 4-7.35 to 11.6 M. C.; Ranae 5-11 .5 to
18.2 M . C.
Speaken: "X" Cabinet, H-28; "B" Cabinet, K-37.
T[RMIHAL PAHLL-
ON OUTPU1 TRANS
~ --· ---·;\
>;" .:., 5PEAK[RCABLI.---
~ ~ • fl[L()t(lll
:c J:
~ ~ 3 ~
::, I i....i i...i
.,; J ~ ~
"'- · I-Speaker Wlrtnll for Types K-37 and H-l8
GfC) 6ABG 63V1' .C
OET . □ SC . fi?J
ISOO~C.PI/\Tr o••
-ISV.OCDSt.GR10. 5 IOVO.C.
340 V.D.C. SOV.D..
6K7G
I.F.AMP.
sov.
ALLVDU-AGESMEASUREDFRONSOCKEr
CONTACrroGROUNO.EXCEPTASNOTEO
6F6G
/OUTPUT\
6.3V.A.C. :: •1'.C.
315V. •o 31SV.0.C.
s,sv.~ 0 a,sv.o.c.
CONTROLO-33V.D.C.CONTRDLG-33V.D.C.
i'lll. l-Socket Voltq-Underalde of Chaula View
The voltaaee Indicated by arrows were measured with a Philco 025 Circuit Teeter
which contains a voltmeter having a resistance 01 1000 ohms per volt . Volume
Control at minimum, ranae switch In broadcast poeition , line voltaa e 115 A. C.
Copyright 1936, Philco Radio & Televis ion Corporation
philcoradio.com

Page2 PHILCO Service Bulletin
r- ------------- - ----- - ----- --- - -- - --- - - -- - -- - -r- - -- - -- - - -- - - -- ---- ---
o 40 f: o ,'~ TUKING CONDENSER /
osJ ~/;;R 6F8 / DET.- OSC. / 1.P. AMP.
,,.,JI.- QD"-....,..;,€2•·F· RAKGE1 6A8G / 6K7G
..--....----.,6--.....-~---,
/
B11.\H ,QgO.!l:1)10
1 ·TAP 1 1 1 3 3 REP +B
13
(;AP
1: ·TAP~ ·TAP£·TAP
5 5 5 1. 6~
4 4 4 4 5 4
(DANT.-RANGE1©AIIT .·RAN,E2@ANT:RANGE3 @ANT.-RANGE4@ANT.·RAKGf 5
·y··,:'1:i ~ ..
@R .F.RANGE1 @R.F.-R ..NGE2 @R.F.·RANGE 3@R .F.-RANGE4 @R .F.·RANGE5 ..,"'"'
It)...,~ w
~!!~
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°' ...r. a:
f'.•o O o ,t
0 /
·1:·tt· ·r~DIRECTIONOF ROTATION
FROM REAR OF SWITCH.
@osc ,RAN6E
1 @ost:RANGE i@osC:RANGE 3 @osc,RANGE4@osc , R..NGE 5
LETTERS INDICATE POSITION OF SW ITCH SCCT\Ot-l5 FROh'\ RF.AR OF CHASSI S. A\.L SWITtHE. S
SHOWN IN POSITION No.1(~) SOLID AREA INDICATES REAR OF SWlTCH WAFER.
SHADED AREA INOIC.A.TES FRONT OF' SWITtH WAFER, SWITCH SECTIONS SHOWN FROM RtAR
UNDERSIDE \'IE'W. A
\
if@F.
AF: 1\9
Fig . 3-Schematic Diagram 37-670
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No. 260
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philcoradio.com

No. 260 PHILCO Service Balletill Page3
Fig . 4-Parte Locatlon-Underelde of Cha88la
Replacement Parts - Model 37-670
Schem. Part Llat Schem. Part Llat
No. 08ICl'lptlon No. Price No. Deecrlptlon No. Price
1 AntennaTransformer(630to 1600K.C.) 32-2108
2 Antenna Transformer (1.68 to 4.75 $0.80 49 Resistor(40000ohms)... .... .. .. .. ... 33-340339$0.20
M.C.)............................ 32-2146
3 AntennaTransformer (4.7 to 7.4 M.C.) 32-2183
4 Antenna Transformer (7.35 to 11.6
M.C.)... .. .. .. .. .. .. .. .. .. .. .. . . . 32-2185
5 Antenna Transformer (11.5 to 18.2
M.C.)... .. .. .. . . . . .. .. .. .. .. .. .. . 32-2175
8 Compensator(two section). ........... 31-6093
7 Compensator(sixsection). ............ 31-6112
8 Condenser(.05 mfd. tubular).. .... . .. . 30-40:IO
9 Resistor(51000ohms)..... .. .. .. .. .. . 33-351339
10 Tuning Condenser... .. ... ........... 31-1855
11 Condenser(40 mmfd. mica)........... 30-1076
12 R. F. Transformer (530to 1600K.C.).. 32-2106
13 Condenser(5 mmfd. mica)....... . .... 30-1077
14 R.F. Transformer(l.68to4 .76M.C.)... 32-2147
15 R.F.Transformer(4.7to 7.4M.C.)..... 32-2177
18 R.F.Transformer(7.3toll .6M.C.)... . 32-2178
17 R.F. Transformer(11.5to 18.2M.C.)... 32-2176
18 Compensator(two section)............ 31-6093
19 Compensator(,ix section)............. 31-6113
20 Condenser(.05 mfd. tubular).......... 30-4123
21 Condenser(.05 mfd. tubular).......... 30-4020
22 Oscillator Transformer (530 to 1600
K.C.).. ... ... . ....... . .. ...... . ... 32-2120
23 Oscillator Transformer (1.58 to 4.75
M.C.).................. . ......... 32-2149
24 Oscillator Transformer(4.7 to 7.4 M.C.) 32-2184
25 OscillatorTransformer(7.3to 11.6M.C.) 32-2186
28 Oscillator Transformer (11.6 to 18.2
M.C.).. ... .. .. ........ ..... . ..... 32-2182
'rT Compensator(four section)............ 31-6108
28 Condenser(700mmf.)..... .. .. . . .. .. . 5863
29 Compensator(sixsection).... .. ....... 31-6112
30 Condenser(3000mmfd. mica)......... 30-1028
31 Condenser
(250mmfd. mica)..... ..... 30-1032
32 Resistor (32000ohms)... .. . . .. . . .. . . . 33-332339
33 Resistor (10000ohms).. ... . . .. .. .. . . . 33-310339
34 Resistor (1.0megohm)................ 33-51033V
35 Resistor (1.0megohm)... ...... ..... . . 33-510339
38 Condenser(.06mfd. tubular). ..... .. . . 30-4444
37 ElectrolyticCdndenser(2, I, 3 mfd.)... 30-2122
38 Shadowmeter.. .. .. . .. .. .. .. . .. . .. .. . 45-2189
39 Condenser(.06 mfd. tubular). ..... . . . . 30-4012
40 Condenser(.05 mfd. tubular) .... ...... 30-4123
41 lat I. F. TraMformer................. 32-2170
42 2nd I. F. Transformer.... . .. . . .. .. .. . 32-2172
43 Condenser(110mmfd. mica)..... ... .. 30-1031
44 Condenser(110mmfd. dual bakelite)... 8035-D0
48 Resistor
(99000ohms).... . .. . . .. .. . . . 33-399339
48 Condenser(.01 mfd. tubular) ........ . . 30-4124
47 Resistor(490000ohms)....... . ....... 33-449339
48 Condenser~ mmfd. mica)....... ... . 30-1063
.80
.60
.70
.80
.40
1.40
.20
.20
4.50
.20
.75
.20
.60
.60
.60
.70
.40
uo
.20
.20
.65
.60
.60
.70
.70
.25
.45
.25
.20
.20
.20
.20
.20
1.85
2.50
.25
.20
2.00
2.00
.20
.25
.20
.25
.20
.20
50 Condenser(.006mfd. tubular)......... 30-4125
51 Resistor (1000ohms)................. 33-210339
52 VolumeControl.. .................... 33-5158
53 Condenser(.015mfd. tubular)...... .. . 30-4358
54 Resistor (490000ohms)............... 33-449339
55 Condenser(.1 mfd. bakelite). ......... 4981).SG
56 Resistor (1 megohm)................. 33-510339
57 Resistor (99000
ohms)..... .. .. .. .. .. . 33-399339
58 Condenser(.03 mfd. bakelite).. .. ..... 8318-SU
59 Res!"tortooooohms)..... .. .. . .. .. . 33-449339
80 Resistor 5000ohms).. ... . . .. .. . .. . . . 33-250339
81 Resistor 45000ohms)..... .. .. .. .. .. . 33-346339
82 Condenser)·03 mfd. bakelite)......... 8318-SU
83 Condenser .03 mfd. bakelite)....... . . 8318-SU
84 Resistor (330000ohms)... .. . .. .. .. .. . 33-433339
85 Resistor (99000ohms)................ 33-399339
88 Resistor (330000ohms)..... . .. .. . . .. . 33-433339
87 Resistor )99000ohms)..... .. .. .. .. . . . 33-399339
88 Resistor 51000ohms) .... . ........... 33-351339
89 Condenser(.1 mfd. tubular)....... . ... 30-4455
70 Resistor (51000ohm,) ... ... ......... . 33-351339
71 Condenser(.015mfd.dualbakelite)..... 3903-LU
72 Resistor (1 megohm)................. 33-510339
n Condenser(.003 mfd. tubular)...... .. . 30-4469
74 Condenser(.003 mfd. tubular)......... 30-4469
75 AudioI~t Transformer.... .. .. .. .. . 32-7671
78 Output nsformer (K-37.H-28)...... 32-7638
77 Coneand Vole•Coll )K-37)........... 36-3020
Coneand V01ceC01l H-28)........... 02625
78 Resistor ?0000ohms)..... .. .. .. .. .. . 33-370439
79 Resistor 15000
ohms).. ... . . .. . . .. .. . 33-315339
80 Resistor~25000ohms)..... . . .. . . .. . . . 33-325639
81 Resistor 51000ohms)..... .. .. .. .. .. . 33-351339
82 Resistor~5600ohmBwirewound).. .... . 33-3282
83 ~i,tor. 258ohmswirewound).. .... . . 33-3281
84 Field C01 A88embly(K-37,H-28)...... 36-3104
85 Filter Choke. ..... . ................. 32-7115
88 ElectrolyticCondenser(8, 10mfd.).. . . . 30-2045
87 Condenser(.25mfd.) tubular. ..... . .. . 30-4446
88 Electrolytic Condenser(8 mfd.)...... .. 30-2025
89 Pilot Lamp.. ... .. .. . .. . .. .. .. .. . ... . 34-2039
80 PowerTransformer 115V., 50-60cycleB32-7640
PowerTransformer 115V., 25-40cycles 32-7641
91 Condenser~015 mfd. dual bakelite).... 3793-D0
92 Powerand one Cont.rel Switch....... 42-1184
93 Range Swjtch~Ant.)....... . ... . ..... 42-1211
94 Range Switch R.F.) .. . ........ . ..... 42-1255
85 Ra.::f.eSwitch (Osc.).. .......... . .. . .. 42-1213
98. Sh owmeterLamp..... .. .. .. .. .. .. . 34-2064
SwitchIndex Plate and Shaft.......... 42-1187
Pilot Lamp AB80mbly... ...... ... .. .. . 38-7706
Dial.. .... . .. .. .. . . .. .. .. .. .. .. .. .. . 27-5213
Hub...... ...... . . .. . .. ............. 28-7187
Flgur11In blaektypeIndicatecircledftgureeIn Bue View. PrlceeSubjectto ChangeWithoutNotice.
September, 1936
.20
1.00
.20
.20
.35
.20
.20
.36
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
.20
2.50
.20
.20
.30
.20
.60
.60
1.80
1.80
.25
1.35
.15
6.50
.40
.75
1.60
1.60
1.60
.09
.50
.35
.40
.12
Schem. Part
No. Deecrlptlon No.
Clamp.............................. 28-2837
Set Screw... .... ... . ... . .... .... .. .. W-1641
Gear (Dial). . .. .. .. .. .. .. .•.. .. .. .. . 28-7185
Gear (Drive).... .. .. .. .. •.• .. .. .. .. . 31-1884
It~:~!!~~::::::::::::::::::::::mm
"C" Washer...... .. .. .. .. .. .. .. .. .. . 28-3904
Mask.. ...... .. . . .. .. .. .. . . .. . . .. . . . 27-5206
Mask Armand Link A88embly........ 31-1887
Mask Washer....................... 27-8318
Mask Guideand Bracket.. ........... 38-7876
Screensand LensHolder AB80mbly.. ... 31-1900
VolumeControlShaft... ........ ..... 38-8060
Retaining Clip.. .... .. .. .. .. .. .. .. . . . 28-4394
~~ngshi ~ld.·::.:::::::::::: :: :: :: :: : ;tm
Tube ShieldBase... . . .. . . .. .•. . .. .. . 28-3898
Socket7 prong. .. .. .. . . .. .. .. .. .. .. . 27-6057
Socket8 prong. ..................... 27-6058
SocketRectifier.. .. .. .. .. .. .. . . . .. .. . 27-6052
TerminalPanel (Ant.)....... .. .••.... 38-7714
Grommet Mtg. R. F. Unit.. . ... . ..... 27-4317
SleeveMtg. R. F. Uni~......... . ..... 28-2257
WasherM"tg. R. F. Unit.. ............ 27-7807
ScrewMtg. R. F. Unit............... W-729
Rubber Mtg. (Gang Condenser).. . .... 27-4325
Spring Mtg. Shadowmeter............ 28-8623
Plate Mtg. R. F. Transformer......... 28-3808
SpacerMtg. R. F. Transformer........ 27-8228
ScrewMtg. R. F. Transformer.... ..... W-1635
ScrewChas,is Mtg.. . . . . .. .. .. . . .. . . . W-1495
WasherChas,is Mtg
... ..... . .. . ...... 28-2089
Shield (Chas,ieBottom). .. . .. . .. .. .. . 38-8143
Snap Fasteners... . . .. .. .. .. .. .. . . .. . 28-4279
Rubber Cushion(X Cabinet).... ... .. . 3558
Rubber Bushing(two required)...... .. 27-4360
Rubber Washer....... ..... .. ... ..... 5189
SpeakerCable............. . ......... 41-3210
A. C. Cord......... . ................ L-2183
Knob Tuning........... .. .... ... .... 27-4330
Knob TuningVernier................. 27-4331
Knob Tone & Volume......... .. ... . . 27-4332
Knob Range Switch...... . .. . . .. . . .. . 27-4326
B 6 X CABINETPARTS
Be1clFrame and Plate. .. .. . . . .. . . .. . 40-5948
GlaB•
......... .......... . .. .. .. ..... 27-8300
~t~ei::::::::::::::::::::::::::::: i~~
SpeakerK-37,"B " Cabinet........... 36-1235
BaffleSilk AMemblr,,X Cabinet....... 40-6016
Speaker(H-28)"X' Cabinet..... .. ... 36-1242
u,1
Price
S0.06
.02
.10
.25
.01
.soc
.01
.30
.45
.soc
.25
.30
.40C
.11
.11
.11
.15
.04
.01
.soc
.45C
.02
.70C
I.SOC
.30C
.40
.10
.10
.10
10
.80
.06
.45
.01
7.25
Pr inted in U.S.A.
philcoradio.com

Page4 PHILCO Service Balletin No. 260
GLOWINGBEAM
INDICATOR
PHASEINVERTER
6J5G
@
®
Pia.5-Dlal Calibration Fig. 6-1.F. Compenaators
Top of Cha .. la Fig. 7-R.F . Com_penaatora
Underside of Cha .. la
Alignment of Compensator•
To accurately adjust this receiver;precisionteet equipmentis neoeMary. A silOl&Igenerator
1110h
u the PHILCOMODEL088SignalGenerator,coveringfrom110to 20,000K. C. is recom-
mendedfor uaein adjustingthe compenaatoraatthe variousfrequenciesspecified. Avisualindi-
cationof the receiveroutput is alaonece.ary to obtain correctadjustment of the compenaatora.
PHILCO MODEL02IICIRCUITTESTER containsa sensitiveoutput meter and is recom•
mendedfor th- adjustments.
Philco Fibre Handle Screw-driverNo. 27-7069completesthe neoeM&ryequipmentfor th-
adjustments. The locationsof the variouscompenaatoraare shownin Figa.6 and 7.
'rho followingprooeduremust be observedin adjustingthe compenaatora:
DIALCALIBRATION-Inorder to adjust thia receivercorrectly,the dial must be alignedto
trackproperlywith the tuning condenser. To do this rotate the tuning controlto the extreme
counter-clockwise{'OBition(maximumcapacity). Loosenthe eel acrew.ofthe dial hub,then turn
dial until the glowingindicator ia centered on aeoondindex line of dial scale(aeeFig. 5). Now
tighten the dial hub set acrewin this poeition.
SHADOWMETERADJUSTMENT-Remove aerial and allow tubes to warm up. Then
adjust the ahadowmeter aafollowa:
1. Movethe ahadowmetercoilbackwardsandforwards,unt,ilthe oppoeiteedgesof the ahadow
are ¾ of an inch fromeach end of the shadowscreen,meaauringalongthe bottom edge of the
ocreen. Adjustmentof the shadowmeter light bracket may be neceaaarr.for perfectcenteri~ .
2. Removethe 6X40 rectifiertube fromits aocketand rotate coiluntil ahadow reachesmina-
mumwidth. Thiawidth must not exceed
1
,{, ofan inch.
3. Replacethe 5X40 rectifiertube in its aocket. The shadowahouldthen widenuntil it is not
morethan •/kinch or leesthan ¼ inchfromeachaideof the screen, meaauringalongthe bott-0m
edge. If th- limits arenot obtainedreadjust the shadowmeteras givenin paragraph•I and 2
until they are reached.
OUTPUT METER-The025 Output Meter ill connected between the plate and cathode
pronp of one of the (6F6O)tubes. The meter is adjusted to uaethe (0-30)volt aeale.
INTERMEDIATEFREQUENCYCIRCUIT
frequllllOY470 K. C.
1. Connectthe 088SignalGenerator output lead through a .I mfd. condenserto the control
grid of the 6A80 tube, and the ground connectionof the output leadto the ch1BBis. Turn the
Volume Control to maximum volume position .
2. Set the range•witch in positionNo. I (Broadoaat),then rotate the tuningcondenserofthe
receiverto approximately680K. C. and adjust the signalgeneratorfor 470K. C.
3. Adjuatcompen.oatora(42S)2ndI.F. Sec., (42P)2nd I.F. Pri., (41S) lot I.F. Sec., and (41Pl
lat I.F. Pri. for maximumreadingon the output meter.
RADIOFREQUENCYCIRCUIT
TuningRan.. (11.1)to (18.2)M. C.
1. Removethe aignal generatoroutput lead from the grid of the 6A80 tube and connectit
throughthe .1 mfd. condenserto termmal No. 1 on aerial input paneland the generatorground
(.,.d to terminal No. 3, rear of chlBBis. Terminals2 and 3 must be connectedby the shorting
link providedon the panel.
2. Set the rangeawitch in position No. 6. Turn the receiverand aignalgenerator dials to
18 M. C. Now adjust compenoator(290) by turning the screw (clockwise)to the maximum
capacitypoeition,then slowlyturningit (counter-clockwiae)until a secondpeaksignalisreached
on the output meter. The firatpeak from maximumcapacityis the imagesignaland must not
beused. NOTE-In adjusting0-0mereceiveraonlyonepeakwillbe observed,therefore,tune the
compenaatorto maximumon this peak. If the above procedure is correctly performed, the
i1111111eaignalwill be found·at 17.06 M. C. by advancingthe signal generator attenuator and
turn111gthe receiverdial to thia frequencymark on the dial.
3. The antenna and R.F. compenaatora(7D) and (190) are now adjusted by connectinga
variable condenserof approximately350 mmfd-Philco Part No. 46-2325acroeathe oacillator
compenaator
(290) (Firat contact fromleft aideof the receiverfacingrear undersideof ch... is)
andground. Leavingtheaignalgeneratorandreceiverdialsat 18M.C., tunethe addedcondenser
from the maximumcapacity point until the aecondharmonic of the receiver oscillatorbeats
against the aignalfrom the gene111torthereby bringingin the aignal. The antenna and R. F.
compenaatoni(70) and (190) arethen adjusted formaximumoutput. Nowremovethe external
condenserand readjuat compensator(290) aa givenin paragraph.2 above.
4. Turn aignaJ generatorand receiverdials to 12 M. C. and adjust compensator(29E) for
maximumoutput. Then adjust compenaatora(19E)and (7E)for maximumoutput.
5. Nowturn the aignalgeneratorand receiverdials to 18 M. C. and readjust oompeDBBlora
(290) Oao.,(70) Ant. and (190) R.F. as givenin paragraphs2 and 3 above.
T1N1lngRange(7.31)to (11.8)M. C.
1. Setrange ,witch in position4. Rotate aignalgeneratorand receiverdialsto II M. C. Now
adjust oompenator (298) by turning the screw(clockwiae)to the maximumoapacitypoaition,
thenalowlyturn it (counter-clockwise)until a aeoond ~ aipal isreachedonthe output meter.
The &ratpeak from maximumcapacity is the image•iinaland must not be used. NOTE-
In adjuatingIIOllle receiveraonly one peak will be obaerved,therefore, tune the compensatorto
maximumon thia peak. If the aboveprooedureiacorrectlyperformed,the image•I willbe
foundat 10.06M. C. by advancingthe aignalgeneratorattenuator and turning receiverdial to
this r~uenoy markon the dial.
2. Ua1ngthe II M. C.signal,compenaatora(1118)R.F. and (7B) Ant.are adjustedby usingthe
prooeduregiven in paragraph 3, under tuning range (11.1) to (18.2) M. C. with the exception
that the externalcondenseris connectedacroeacompensator(298) (Third contact fromleftside
of the receiver)and ~round.
3. Removethe variablecondenserand readjust compenaator(298) Oao.aa givenin paragraph
I above.
4. Turn the aignalgeneratorand receiverdiala to 7.5 M. C. and adjust compenaatora(29C)
Qao; aeries,(11C) R.F. and (7C)Ant. formaximumoutput.
I. Due to the alight interaction of the high and low frequencr compen.oatoraof thia range,
compenaatora
(298) Oao., (198) R.F. and (7B) Ant. must be readjusted usingthe procedurein
paragraphs1and 2 above.
TuningRan.. (4.7)to (7.4) M. C.
1. Set rangeawitchin Poeition3. Turn signalgeneratorand receiverdialsto 7.0 M. C. Now
adjust compensator(29) O.c., (19)R.F. and (7) Ant. for maximumoutput.
2. Turn the oignalgeneratorand receiverdials to 5.0 M.C. and adjust compen.oatora(28A),
(19A)and (7A) for maximumoutput.
3. Turn the signalgeneratorand receiverdials to 7.0 M. C. and readjust compenaatora(29)
0.. , (19) R.F. and (7) Ant. formaximumoutput.
TuningRange(1.18) to (4.75) M. C.
1. ·Set the rangeawitchin position2. Turn the signalgeneratorand receiverdialsto 4.6M. C
2. Nowadjust°compensators(27B) Oac.,(18A) R.F. and (SA)Ant. for maximumoutput.
3. Rotate the aignalgeneratorand receiverdials to 1.7M. C. Compenaator(27C)Oae.aeries
is nowadjusted for maximumoutput as followa:
Firat tune compensator(27C)for maximumoutput. then vary the tuning condenserof the
receiverfor maximumoutput about the 1.7 M. C. dial mark. Now turn compen.oator(27C)
alightlyto the right or left and vary the receivertuning condenserformaximumoutput. If the
output readingincreaaea, turn coml"'noator(27C)in the samedirectiona trifte more, and again
vary the tuning condenserfor maximumoutput. If the output decreaaee,set the compenaator
in the oppoeite direction. This procedureof firataetting the compenaatorand then varyingthe
tuning_
condenaer is continueduntil there is no further gain in output reading.
4. Turn signal generator and receiver dials to 4.5 M. C. and readjust compenaators(278).
(18A)and (8A) aa given in Paragraphs 1and 2 above.
TuningRange(530)to (1600)K. C.
1. Set rangeswitchin poeitionNo. I (Broadcaat). Rotate the signal ~eneratorand receiver
dialsto 1600K. C. Nowadju,t compensators(27) 0.. ., (18)R.F. and (6) Ant. for maximum
output.
2. Tuneaignal_generatorand receiverdialsto 680K. C. Compenaator(27A)Osc.aeriesisthen
adjustedfor maximumoutput as givenin paragraph3 under tuningrange(1.118)to (4.71) M. C.,
the onlydifferencein the procedure
beingin the frequencyused.
3. Readjust compensator (27) for maximum output, by turning the signal generator and
receiverdialsto 1600K. C.
4. Turn the aignal generatorand receiverdials to HOOK. C. and adjust compensatora(18)
R.F. and (8) Ant. for maximumoutput.
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