Stromberg-Carlson 130 Series Engineering Data

Engineering Data
Stromberg-Carlson No. 130 Series Radio Receivers
STROMBERG-CARLSON TELEPHONE MANUFACTURING COMPANY
Rochester, New York
ELECTRICAL SPECIFICATIONS
Type of Circuit_Superheterodyne
Tuning Ranges_A—540 to 1500 Kc.; B—1450 to 3500 Kc.; C—5600 to 18,000 Kc.
Number and Types of Tubes:
Nos. 130-H, 130-U, and 130-L Receivers_2 No. 6K7, 1 No. 6A8, 1 No. 6H6, 1 No. 6F5, 1 No. 6F6, 1 No. 80
Nos. 130-M and 130-R Receivers_2 No. 6K7,1 No. 6A8, 1 No. 6H6, 1 No. 6F5, 1 No. 6F6, 1 No. 80, 1 No. 6E5
Power Supply Voltage_i-i—105 to 125 Volts
Power Supply Frequency_25 to 60 Cycles and 50 to 60 Cycles
Input Power Rating_70 Watts
Frequency of Intermediate Amplifier_465 Kilocycles
APPARATUS SPECIFICATIONS
Nos. 130-H, 130-U, 130-L, 130-R_50 to 60 Cycles_P-26240 Chassis; P-26171 Loud Speaker
Nos. 130-HB, 130-UB, 130-LB, 130-RB___25 to 60 Cycles_P-26247 Chassis; P-26171 Loud Speaker
No. 130-M_ 50 to 60 Cycles_P-26240 Chassis; P-26170 Loud Speaker
No. 130-MB_25 to 60 Cycles_P-26247 Chassis; P-26170 Loud Speaker
CIRCUIT DESCRIPTION
The No. 130 Series of Radio Receivers are divided into two groups; the Nos. 130-U, 130-H, and 130-L are
seven tube receivers and are not equipped with the "Tri-Focal Tuning System". The Nos. 130-M and 130-R are
eight tube receivers and are equipped with the exclusive Stromberg-Carlson "Tri-Focal Tuning System". A
socket is provided on the rear of the chassis for making connections between the tuning indicator and receiver
circuits. The chassis used in these different models of No. 130 Receivers are identical.
These No. 130 Receivers are composed of a seven tube chassis employing metal lubes, and have three tun¬
ing ranges. In order to obtain maximum performance from these receivers, a sensitivity control is provided for
use on the standard broadcast hand only. Its control knob is located on the rear of the chassis base. When
either the "B" or "C" ranges are in operation, this sensitivity control is automatically cut out of the circuit so
that the receiver will function at its maximum sensitivity on these two ranges. In some localities it will be
found that without the use of this control, it will be impossible to eliminate adjacent channel interference.
When this condition is obtained, the receiver should be tuned accurately to the desired station, and this sensi¬
tivity control adjusted so that minimum interference is obtained from the interfering station. See Figure 1.
The various tubes are used in these receivers as follows: One No. 6K7 lube is used in the R. F. Amplifier,
and the other No. 6K7 is used in the I. F. Amplifier. The No. 6A8 tube functions as both Oscillator and Modu¬
lator tube. The No. 6H6 tube is used as a Demodulator and Automatic Volume Control tube. The No. 6F5 tube is
used in the Audio Frequency Amplifier Stage (Driver), and the No. 6F6 tube is used in the Audio Power Output
Stage. The No. 80 tube is the Rectifier tube of the power supply unit. In the Nos. 130-M and 130-R Receivers
the No. 6E5 tube is used as the indicator of the Tri-Focal Tuning System.
NORMAL VOLTAGE READINGS
The various values of voltages listed in the following table are obtained by measuring between the various
tube socket contacts and the chassis base, with the tubes in their respective sockets. The receiver is, therefore, in
operation when the measurements are made. Figure 2 shows the terminal layout of the sockets with the proper
terminal numbers.
POWER SUPPLY CORD, ANTENNA AND GROUND TERMINALS
LOUDSPEAKER SOCKET,
SENSITIVITY CONTROL (NORMAL POSITION)
TO DECREASE SENSITIVITY. ROTATE KNOB
COUNTER-CLOCKWISE.
SOCKET
Fig. 1. Location and Operation of Sensitivity Control.
P-26436 Form 2103 Issue 1 Printed in U. S. A.