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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.

General Electric M-49 Radio-Phonograph (Jeff B.) - RF CafeRadio Service Data Sheets were published by various electronics trade magazines (like this 1935 issue of Radio−Craft) 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.

General Electric M-49 Radio-Phonograph (lid closed) (Jeff B.) - RF CafeMany 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. Update - see below...

The two photos were provided by RF Cafe visitor Jeff B., of Beverly, Massachusetts. It appears to be in extremely nice condition for a 1930s era unit. These are now the only images of the M-49 anywhere I can find on the Internet. He is restoring the unit to working order.

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

RCA Victor Model 102 4-Tube A.C.-D.C. T.R.F. Receiver Radio Service Data Sheet, January 1935 Radio-Craft - RF CafeA feature of the power supply circuit - only one secondary is used in power auto-transformer 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.

 

 

 

Posted March 25, 2022
(updated from original post on 10/24/2016)


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.

Crane Aerospace Electronics Microwave Solutions: Space Qualified Passive Products

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright:
1996 - 2024

Webmaster:

Kirt Blattenberger,

BSEE | KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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