Stromberg-Carlson 345 Engineering Data

Engineering Data
Stromberg-Carlson No. 345 Radio Receivers
STROMBERG-CARLSON TELEPHONE MANUFACTURING COMPANY
ROCHESTER, NEW YORK
ELECTRICAL SPECIFICATIONS
Type of Circuit_Superheterodyne with Electric Tuning
Tuning Ranges_A—.53 to 1.7 Me.; B—2.25 to 7.6 Me.; C—7.6 to 23 Me.
Number and Type of Tubes___l No. 6K8, 2 No. 6K7,1 No. 6H6,1 No. 6F5,1 No. 6C5, 2 No. 6Y6G, 1 No. 6U5,1 No. 80
Voltage Rating_105 to 125 Volts
Power Frequency Rating_25 to 60 Cycles and 50 to 60 Cycles
Input Power Rating_85 Watts
Frequency of Intermediate Amplifier_455 Kilocycles
APPARATUS SPECIFICATIONS
No. 345-F Receiver_50 to 60 Cycles; P-29447 Chassis Assembly; P-26170 Speaker
No. 345-FB Receiver_25 to 60 Cycles; P-29448 Chassis Assembly; P-26170 Speaker
No. 345-M Receiver_50 to 60 Cycles; P-29447 Chassis Assembly; P-26170 Speaker
No. 345-MB Receiver_25 to 60 Cycles; P-29448 Chassis Assembly; P-26170 Speaker
CIRCUIT DESCRIPTION
These receivers are ten tube, instantaneous "Electric Tuning" superheterodyne receivers employing metal
tubes and an efficient dynamic speaker. There are three tuning ranges, the frequency limits of each range being
listed under the "Electrical Specifications", given above.
The electric tuning circuit is arranged so that eight favorite stations located in the Standard Broadcast
range (.53 to 1.7 megacycles) may be set up for instantaneous selection by means of the push buttons. (Local
and other stations that give the best daytime and evening service should be selected). To properly set up the elec¬
tric tuning arrangement for the eight favorite Standard Broadcast Stations, read the section, "Instructions for
Setting Up the Electric Tuning Arrangement", appearing on page 4 of this book. Manual or electric tuning for
the Standard Broadcast range is easily obtainable by simply rotating the Range Switch control knob so that the
arrow on the knob points in the direction of the designation for the desired type of tuning or range. When man¬
ually tuning the receiver in either the Standard Broadcast or Short Wave ranges, the electric tuning arrangement
is made inoperative and the dial of the receiver is illuminated. When the Range Switch control knob is set for
electric tuning (arrow on Range Switch control knob pointing in direction of the star), the dial illumination
ceases and the station letters of the eight stations which are set up for electric tuning become illuminated. When
manually tuning these receivers or when setting up the eight desired stations for electric tuning, resonance with
a signal is indicated by means of the tuning indicator tube which operates on the cathode-ray principle.
Fig. 1. Terminal Layout for Voltage Measurement Chart and Location of the
Various Aligning Capacitors.
P-30026 Issue 1 Printed in U. S. A.