Philco 16 Service Bulletin

PHILCO
RtO. U.$. PAT, Off.
Price change effective
after Sept. 15, 1933.
Service Bulletin-No.
165-B
(This Bulletin Supersedes Service Bulletin No. 165)
Model 16
TnE PHILCO
RADIO
MonEL 16 is an eleven-tube superhetero<lyne broadcast and short-wave receiver,
operating upon alternating current and employing the high-efficiency 6.3 volt tubes, automatic inter-
statiou noise suppression, and a frequency (wave-band) coverage that permits reception of the short-wave
(high-frequency) broadcast programs. The same superheterodyne circuit is used for all reception. The
Receiver is equipped with a five-point wave-band switch. The ranges are-
(1) 520 K. C. to 1500 K. C. (3) 3.2 M. C. to 6.0 M. C.
(2) 1.5 M. C. to 4.0 M. C. ( 4) 5.8 M. C. to 12.0 M. C.
(5) 11.0 M. C. to 23.0 M. C.
The Receiver employs a Philco Type 77 tube for first detector, a Type 76 for oscillator, a Type 78
for first I. F., a Type 78 for second I. F., and a Type 37 for second detector. The automatic interstation
noise suppression circuit uses a Type 78, the first A. F., a Type 77. The driver (second A. F.) is a Type 42;
the class "A" amplification is accomplished with two Type 42 tubes as triodes; the rectifier is a Type 5-Z-3.
The intermediate frequency is 460 kilocydes. The power consumption of Model 16-122 is 130 watts; of
Model 16-121, 120 watts.
'fable 1-Tube Socket Data*-A. C. Line Voltage 115 Volts
Inter-
2nd
hi hi.
2nd 2nd
Station
ht A. F. Rectl·
Circuit
0,1.
01c.
I.F.
I.F. 0,1.
Nol11 A.F. (Drlv- Output
n,r
Supr.
er)
Circuit
- - - -
- -
- - - -
- -
Type Tube
77
75
78
78 37 78 77 42 42
42
5-Z-3
- - - -
- -- - - -
- - - - - -
- -
Filament Volts-F to F ........
0.3 6.3 6.3
6.3 0.3 0.3 fl.3 6.3
6.3 6.3 4.7
- - - -
- -
- - - - - - - -- - - -- - - -
Plate Volts-P to K ...........
220 53 225 230 0 1.8 130 220 340 340 400
- - - -
- -
- -
- -
- -
--
- - - - - -
- -
Screen Grid Volt.o-SG to K ....
so
-
so so -
1.8
1.8 220 340 340
-
- - - - - -
----
- - - -
- - - - - - - -
Control Grid Volts-CG to K ... 1.0
M
0
0 .2 UI .4 .6
34 34
-
- - - -
--
- - - - - -
- -
- -
- - - -
Cathode Volts-K to F ........
4.2 1.9 2.2 2.5
0
0 0 0
0 0
-
• All of the above readinl!' were taken from the u!1der,i4e of the cha~111, ming test prods and leads with a suit-
able A. C. voltmeter for filament voltages, and a h,gh-re,nstance multi-ran11e D. C. voltmeter for other readings.
The Philco Model 048 All-Purpose Set Tester is highly recommended for this use. Volume control set at maximum
nnd stn.tion .,eJector turned to low frequency end; interstation noise suppression circuit J><?lentiometer turned nil
the way to the right: and toggle switch (interstation nmse suppression circuit) in
"0:,./ .. (''S")
position. Reuding•
taken with a plu11-in adapter
will NOT be satisfactory.
NOTE-These values
are for Model 16-122.
Model 16-121 uses a
Type 80 Rectifier
Tube. SeeNote,page
4, at end of Replace-
ment Parts Li!t.
Table 2-Power Transformer Data
TYPE 1-2
TU8E
TY•E4:1.
TUU-fc:==~
n,r.u
TUIE
TYPE 5·1.·3 TVPE 77
TUBE TUBE
TYPri 37
TUIE
TYPE711
TUIE
TYPE70
TU&E
~Fl~. 1-Top View of Chassis, Showing Tube Locations and Major Puts
~
~ ~~}
Sockets
c-~
78 } Sockets
·ua1
Terminal
1-2
3-5
0-7
8--10
4
9
A. C. Volta Circuit
Color
105-125 Primary White
6.3
Filament
Black
5.0 Filament of 5-Z-3 Blue
800
Plates of
5-Z-3
Yellow
-
Center Tap of 3-5
Black-Yellow
Tracer
-
Center Tap of 8--10
Yellow-Green
Tracer
g
42 Socket
,
~
~
5-Z-3
Soeker
Terminal Arrangement of Tub, Sock1to Viewed from Und1rold1 of Chassis