Stromberg-Carlson 520 Engineering Data

ENGINEERING DATA
STROMBERG-CARLSON NO. 520 RADIO RECEIVERS
STROMBERG-CARLSON TELEPHONE MANUFACTURING COMPANY
ROCHESTER, NEW YORK
IDENTIFICATION TABLE
Input Power
Model
Frequency Chassis
Cabinet
Speaker
Phonograph Equipment
520-H
50-60 Cycles 32832
32306 26171
Use No. 16 Record Player
520-HB
25-60 Cycles 32833
32306
26171
Use No. 16 Record Player
520-J 50-60 Cycles
32832
32098
26171
Use No. 16 Record Player
520-JB
25-60 Cycles
32833
32098
26171
Use No. 16 Record Player
520-L
50-60 Cycles 32043
32099
32166
Use No. 16 Record Player
520-LB
25-60 Cycles
32044
32099
32166
Use No. 16 Record Player
520-PF
60 Cycle
32178 32101
32166
32286
520-PFB
25 Cycle
32179 32101
32166 32287
520-PL
60 Cycle
32176 32102
32166 32283
520-PLB
25 Cycle
32177 32102
32166
32284
520-PG 60 Cycle
32986
32988
32989
32822
520-PGB 25 Cycle
32987
32988
32989
32823
SPECIFICATIONS
Type of Circuit_
Tuning Ranges_
Voltage Rating_
Number and Type of Tubes—7
1—6SK7 R. F. Amplifier
1—6SA7 Modulator and Oscillator
1—6SK7 I. F. Amplifier
1—6SQ7 Demodulator, A. V. C., and Audio Amplifier
Input Power Rating, 520-H, J, and L_
Input Power Rating, 520-PF_
Input Power Rating, 520-PL, and PG_ _
Intermediate Frequency _ _ __
Speaker Voice Coil Impedance at 400 Cycles
Speaker Field Coil Resistance . .
-Superheterodyne
- A—540 to 1600 Kc., C—5700 to 18000 Kc.
-A.C. 105 to 125 Volts
1-—6V6GT Output
1—6U5 Tuning Indicator
1—5Y3G Rectifier
-78 Watts
- 95 Watts
110 Watts
455 Kilocycles
Approximately 1.5 Ohm
Approximately 1050 Ohms
FEATURES
GENERAL. This is a seven tube, two gang, two range
receiver with the 1600 kc. to 1700 kc. police band in¬
cluded in the broadcast range. The dial is edge-lighted
to provide clear visibility without glare. Iron core
coils are used in the low frequency of each range so
that greater accuracy of alignment can be obtained.
A compensator circuit is provided in the broadcast
range to prevent oscillator drift.
Eight button automatic tuning is provided so that six
favorite stations may be set up; the other two buttons
are for switching to "Phonograph" or "Radio".
Tone is adjusted on the 520-H, J, and L by a step tone
control, which regulates both bass and high frequency
response. Separate bass and treble controls are pro¬
vided on the phonograph models.
Provision is made for a record player to be used with
all models not already equipped with phonograph
mechanism without additional wiring. The Nos.
520-PF, PL, and PG phonograph models are equipped
with an automatic record changer using a crystal
pick-up in conjunction with a specially equalized cir¬
cuit. The record player shifts and plays either 10 or
12 inch records.
A Loop antenna is provided in these receivers so that
no antenna and ground connections whatsoever are
required. However, antenna and ground terminals
are provided on the chassis, so that an external an¬
tenna may be used for improved reception if it is
desired.
AUTOMATIC TUNING.. Eight button mechanical au¬
tomatic tuning is provided, so that six favorite sta¬
tions may be set up. The other two buttons are for
switching to phonograph or radio.
PHONOGRAPH OPERATION. A jack is provided on
the back of the chassis of all receivers not already
equipped with phonograph mechanism, into which a
record player may be plugged, and a push button is
provided on the front of the receiver for switching
from "Radio" to "Phonograph".
TELEVISION. A. foil is provided on the back of the
chassis into which a television receiver may be
plugged. Switching to phonograph makes the audio
amplifier and loud speaker available for use with tele¬
vision receivers designed for this type of sound re¬
production.
ACCESSORIES
ANTENNA. The built-in loop antenna provided in
these receivers will give satisfactory operation in
most locations. However, antenna and ground termi¬
nals are provided on the chassis and for improved re¬
ception, a Stromberg-Carlson All-Wave Antenna is
recommended. These antennas are supplied in kits
containing all the necessary parts for mounting and
installation, and are designed especially for use with
all Stromberg-Carlson receivers.
PLAYING RECORDS (520-H. J, AND L RECEIVERS).
For receivers not already equipped with phonograph
mechanism, a Stromberg-Carlson record player is rec¬
ommended. They are designed for use with this re¬
ceiver, and all that is necessary is to connect the rec¬
ord player to the single prong socket provided in the
chassis, push in the phono button and proceed to oper¬
ate. The volume and tone may be controlled with the
P-33016 Issue 1 Printed in U. S. A.