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
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