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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 typing up your telephone line, and a nice 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.

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American-Bosch 524A Automotive Radio Schematic
June 1935 Radio-Craft

June 1935 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.

American-Bosch 524A: In this receiver a unique mechanical design has been utilized to secure an attractive appearance, mechanical stability and desirable service features. The circuit has been designed and adjusted for minimum internal noise, and is equipped with an efficient motor ignition noise trap. The vibrator "B" unit is of latest, non-synchronous type, with readily adjustable contacts. The volume control is designed to maintain good bass response at low volume levels. This set is supplied with a kit of spark suppressors, etc.; the installation manual furnishes complete information on the elimination of noises due to: (1) antenna pickup; (2) antenna lead-in pickup; and, (3) noise conduction into the set via the battery cable.

American-Bosch 524A Radio Schematic

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

American-Bosch 524A 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 227 Radio Service Data Sheets as of December 28, 2020.

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American-Bosch 524A Automotive Radio SchematicJune 1935 Radio-Craft

American-Bosch 524A Radio Schematic

American-Bosch 524A Automotive Radio Schematic
June 1935 Radio-Craft