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Broadcast
(BC)...
Medium Wave (MW)
Short Wave (SW)
Intermediate Frequency
._.
Radiotron Complement:
WESTINGHOUSE MODELS 512A. X and Y
ELECTRICAL SPECIFICATIONS
Frequency Ranges
530-1720 kc.
1720-5500 kc.
5500-18000 Ire.
(1) W -6A8
First Det.-Oscillator
(4) W
-6F6..
(2) W -6L7......___.. _..
_.
Intermediate Amplifier
(5) W -5W4
(3) W -6Q7
Second Det.-A.V.C. and 1st A.F. Stage
Pilot Lamps (2)
Power Supply Rating
Power Output Rating:
2.0 watts
Type
3.0 watts
Undistorted
Maximum
Alignment Frequencies
600 kc. (ose.,) 1500 kc. (ose., ant.
....5000 kc. (osc. ant.)
17000 kc. (ose. ant.)
..........460 kc)
Power Output
Full -wave Rectifier
Mazda No. 46, 6.3 volts, 0.25 amperes
105-125 volts, 25-60 cycles, 80 watts
Loudspeaker:
Electrodynamic
Voice Coil Impedance
_...
_
...1.8 ohms at 400 cycles
MECHANICAL SPECIFICATIONS
Cabinet Dimensions
Height
Width
_. _..
Depth
.._..._.
_..
Weights (Shipping)
Operating Controls
(1) Speech, Music and Power Switc'-
Tuning Drive Ratios
Model 512A
Model 5121
Model 512Y
11 % inches
39 inches
40 inches
23
inches
22 inches
23 inches
914 inches
12 inches
12 inches
39
pounds
70 pounds
75 pounds
1
Tone;
(3) Tuning;
(4) Range Selector;
(5) Volume
18 to 1 and 90 to I
GENERAL FEATURES
These receivers employ the same chassis and have many distinc-
tive features. The. Mantel Model employs an 8 -inch dynamic
loudspeaker
and
the
Console
Models
employ
a' .12
inch
dynamic loudspeaker. The superheterodyne circuit is used with
such features of design as magnetite core adjusted i -f trans-
formers, air dielectric trimmers, aural compensated volume con -
CIRCUIT ARR
The first detector and oscillator functions are accomplished
in a single tube, a W -6A8.
The input of this tube is coupled to
the antenna through a tuned transformer.
The R.F. coil system is greatly simplified in comparison to
previous years. The antenna coil consists of only four windings
to cover three ranges.
By referring to the schematic circuit
it will be noted that by an extremely simple switching
circuit coil L-1 is used only as the short wave secondary coil;
coil L2 is used (depending on the switch position) as either the
trot, continuously variable tone control with music-,oice switch
automatic volume control, resistance coupled audio system, all
metal radiotrons, and a dust -proof loudspeaker.
Trimming adjustments are located at accessible points. Their
number is reduced to the least that is consistent with efficient
operation.
Tuning is continuous throughout the three ranges.
ANGEMENT
short wave primary winding or the medium wave secondary
winding; coil L-3 is used either as the broadcast secondary
winding or the medium
wave primary winding; coil L-4 is the
broadcast primary winding only.
The oscillator coil system
uses
three separate windings in the
grid circuit and three separate windings in the plate circuit.
'The unused lower frequency windings are shorted out by means
of the shorting bars on the range selector switch.
Or
5W4
6F6
+245r
135
1<MAI
53MA. 5MA
%d
410 ,
@D;®ja
Q
I-
-39MA
+13r
4340
\ A\
V
=ELECT CAPACITptS
rn
n
-16.Ss
0.5
+I -5s
+155s.
+235
-600 K.0 SERIES TRIMMER
ON
REAR APRON.
Radiotron Socket Voltages and I.F. Trimmer
Locations
64
+I. _
460 KC
MU
SEC
PRIM ADJ
460 KC
---
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I( rise
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(( Is0ONc
R.F. Alignment Points
BOTTOM VIEW OF CHASSIS.
2.1.1.1.11r91
Í
SPEAKER
CABLE
-OSMFD
13ú0a
_
1-32n
FILL
COIL
REO d BLACK
R Dk YELLOW
BLUE
2
VOICE
COIL
I3
5 -
RED
OUTPUT TRANSF
Reproducer Wiring Diagram
Is
L16
1650
MMI
1120
IOW 0a0
c
TE
NNON
nºn,NaS
D
C0
11-0",1.17
C16
Range Selector Diagram
(601)-BUCK
- To C15
YELLOW
'
TO Gilt 617
U
-®i-2MMF
BUSBUS--®F124W
UI
TO E7
Bus -.10 C-12
BUS
112 PaAF
\
6A0
C -M
05
9.
Mrs
1-12 MMF
BUS-to
BUS-® Í It MMF
BLUE
TO OPtK 6A8
SWITCH SECTIONS ARE SHOWN
IN M.W. POSITION.
WHEN ALIGNING THE R.F. CIRCUITS, THE CHAS-
SIS BOTTOM SHIELD MUST BE IN PLACE ON THE
CHASSIS AND SECURELY FASTENED WITH ALL OF
THE RETAINING SCREWS.
IF THE CHASSIS BOTTOM
PLATE IS REMOVED, COIL SHIELDING WILL BE IN-
COMPLETE AND THE R.F. CIRCUIT WILL OSCILLATE.
WHEN ADJUSTING I.F. CORES WITH THE CHASSIS
BOTTOM PLATE REMOVED OR DOING TROUBLE
SHOOTING ON THE CHASSIS, OSCILLATION MAY BE
PREVENTED BY USING A SHORT LENGTH OF WIRE
WITH TWO CLIPS TO CONNECT TOGETHER THE PAR-
TITION SHIELDS BETWEEN THE ANTENNA AND
DETECTOR COILS, AND BETWEEN THE DETECTOR
AND OSCILLATOR COILS.
When adjusting the Air Dielectric R.F. trimmers, it is neces-
sary to use a special tool (See H-29644 in parts list) to slacken
the lock nut on the trimmer, previous to the adjustment, and to
tighten it again after the adjustment.
Another special tool
(See H-29643 in parts list) is available for making the actual
adjustment to the trimmer.
The adjustment should be made
upward or downward on the plunger with a twisting motion.
The special tool designed by the Canadian Westinghouse Com-
pany for this purpose is double ended; one end having a pin
for
the R.F. adjustments, the other end is a special socket screw
driver for use in making I.F. adjustments.
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