General Electric Model M-49, 4-Tube Radio-Phonograph Dual-Wave Superhet.
Radio Service Data Sheet
January 1935 Radio-Craft

January 1935 Radio-Craft

January 1935 Radio Craft Cover - RF Cafe[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.

Radio Service Data Sheets were published by various electronics trade magazines back in the early to middle decades of the last century. SAMS Photofact document sets were published on just about every appliance made, and those had much more detail than these briefs. However, for the low-budget repair shop or the do-it-yourselfer, the Radio Service Data Sheets were a godsend. I have been scanning, cleaning up, and posting all the ones I find in my vintage electronics magazine collection. See a complete list at the bottom.

Many fine examples of restored vintage radios can be found on the Internet, but I could not find one for this General Electric Model M-49.

General Electric Model M-49 4-Tube Radio-Phonograph Dual-Wave Superheterodyne

A feature of the power supply circuit ­ only one secondary is used in power auto­transformer P. T. This is accomplished by having a cathode-type rectifier. series fila­ments, and taps on the secondary of P.T.

Second-detector coil L1 is tapped so that the tuning range may be extended merely by shorting out a portion of the coil. The oscillator circuit is not tapped, the high frequency range being obtained by use of its second harmonic instead of the funda­mental for obtaining the LF.

RCA Victor Model 102 4-Tube A.C.-D.C. T.R.F. Receiver Radio Service Data Sheet, January 1935 Radio-Craft - RF Cafe

 

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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 219 Radio Service Data Sheets as of November 15, 2017.