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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...

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Zenith 6-Tube All-Wave Superhet. Chassis No. 5634
November 1936 Radio-Craft

November 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 have been scanning and posting Radio Service Data Sheets like this one featuring the Zenith 6-Tube All-Wave Superheterodyne Chassis No. 5634 radio receiver for many years now. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. The thumbnail image of the Zenith Chassis No. 5634 came from the RadioMuseum.org website.

Zenith 6-Tube All-Wave Superheterodyne Chassis No. 5634

The anode grid of V1 is 175 V. All measurements are made with a 1,000 ohms-per-volt meter, from socket to ground. and with the antenna and ground disconnected. The line voltage for above readings is 112 V. Power consumption of the receiver is 75W.; the power output is 4 W. The LF. stage is aligned by connecting the leads from the signal generator to ground and the control grid cap of V1. Set test oscillator at 456 kc. and adjust all 4 trimmers for highest output. Then change leads to antenna and ground of receiver and adjust the wave trap for minimum output reading. Set generator at 6 mc. and adjust oscillator trimmer on gang condenser for correct dial reading on band B. Set generator to 1,400 kc. and adjust oscillator trimmer of band A for dial setting, also adjusting antenna trimmer for best output. Set generator to 18 mc. and align receiver dial at this position for highest output. Set generator to 600 kc. and rock receiver dial on band A to best output. Readjust trimmers at 1.400 kc.

Posted January 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 227 Radio Service Data Sheets as of December 28, 2020.

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Zenith 6-Tube All-Wave Superhet. Chassis No. 5634November 1936 Radio-Craft

Zenith 6-Tube All-Wave Superheterodyne Chassis No. 5634

Zenith 6-Tube All-Wave Superhet. Chassis No. 5634
November 1936 Radio-Craft