RCA Victor Model M109 "De Luxe" 7-Tube Auto-Radio Receiver
Radio Service Data Sheet
June 1936 Radio-Craft

June 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.

I could not find any photographs of an RCA Victor Model M109 automobile radio. You might think that with it being a 'De Lux' model that there would be plenty of examples around, but evidently not. The Radio Service Data Sheet was part of a group of six such instances that appeared in the June 1936 issue of Radio-Craft magazine.

RCA Victor Model M109 "De Luxe" 7-Tube Auto-Radio Receiver
Radio Service Data Sheet

(Class B output; input noise filter; 2 units; tone control; 540 to 1,600 kc.)

The required operating voltages of this receiver are all shown on the detail drawing. All values are measured to ground, and most of them may be made with an ordinary high resistance meter, while a few must be made with a V.T. voltmeter. The battery input voltage is 6.6 V. and volume control at max. with no input signal. Alignment frequencies are: 175 kc. for I.F., 1,400 kc, for R.F. and for osc. trimming, and 600 kc. for osc. padding. The power output is 3.5 W. undis-torted, and 6 W. maximum, and current consumption is 7.2 A.

The grounding of the outer end of the antenna lead-in shield is very critical, since interference may be minimized by selecting the proper point of attachment to the car frame, the point having to be found by ex-periment.

Posted June 20, 2017

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 255 Radio Service Data Sheets as of April 30, 2025.

Werbel Microwave power dividers, couplers - RF Cafe Website

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 lady's voice announced "You've Got Mail" when a new message arrived...

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

My Hobby Website:
AirplanesAndRockets.com

My Daughter's Website:
EquineKingdom