RCA Victor M-104 (and M-108) Automotive Radio Schematic
June 1935 Radio-Craft

June 1935 Radio-Craft

June 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.

RCA Victor M-104 (and M-108): The M-104 is a single-unit receiver; the M-108 has the reproducer separate from the set assembly. From antenna to reproducer, this car-radio receiver has been designed for interference-free operation without recourse to suppressors. The ground-end of the antenna coil, for instance, is not grounded directly at the receiver chassis, but is carried to a point on the car frame at which circulating noise currents do not become mutual to the receiver input; the R.F. transmission line favors broadcast signals and greatly attenuates interference fre­quencies. A self-rectifying, synchronous plug-in vibrator "B" unit is used. A tone- or speech-clarity control.

RCA Victor M-104 (and M-108)

Remarkable improvements in car sets are indicated these diagrams of the new automotive radio receivers shown on the preceding page.

RCA Victor M-104 (and M-108) Radio Schematic, June 1935 Radio-Craft - RF Cafe

RCA Victor M-104 (and M-108) Radio Description, June 1935 Radio-Craft - RF Cafe



Posted June 1, 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 220 Radio Service Data Sheets as of February 2, 2018.