RCA Model 103, 4-Tube A.C. compact Dual-Wave Superheterodyne Radio Service Data Sheet
February 1936 Radio-Craft

February 1936 Radio-Craft

[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

All necessary voltage information is given on the chassis layout diagram. The LF amplifier is aligned by connecting the leads of a service oscillator from cap of V1 to chassis. Tune C11 and C12 for best output. Then feed a 1,400 kc. signal to antenna and ground, set receiver dial to 1;400 kc. and adjust C24 and C25 for highest output. Set oscillator at 600 kc. and align trimmer at rear of chassis. Dial reading of set should fall fairly close to 600 kc. The short-wave band will need no adjustment. On the latter band the same oscillator coil is employed, a harmonic being used for actual reception. Power transformers are available for either 25- or 60-cycle use. The power output is 1.9W. (undistorted), and 3W. (max.). The power input is 40W. at 115V. Filament circuit is novel in that the pilot light and V3 are connected to one winding, while all the other tubes are in series on another section. (Coil resistances, in parenthesis.) Two of the tubes are of multi-purpose type

RCA Model 103, 4-Tube A.C. compact Dual-Wave Superheterodyne

Posted July 19, 2016

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of December 28, 2020.

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RCA Model 103, 4-Tube A.C. compact Dual-Wave Superheterodyne Radio Service Data SheetFebruary 1936 Radio-Craft

RCA Model 103, 4-Tube A.C. compact Dual-Wave Superheterodyne Radio Service Data Sheet
February 1936 Radio-Craft