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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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Westinghouse Model WR 207 & WR 208 5-Tube Dual-Band Superheterodyne
Radio Service Data Sheet
December 1936 Radio-Craft

December 1936 Radio-Craft

December 1936 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.

Westinghouse WR 207 front (RadioMuseum.org) - RF Cafe

Westinghouse WR 207 back (RadioMuseum.org) - RF Cafe

Westinghouse WR 207 (RadioMuseum.org images)

For many years I have been scanning and posting Radio Service Data Sheets for sets like this Westinghouse Model WR 207 & WR 208 5-tube dual-band superheterodyne tabletop radio model. Hundreds of them appeared in magazines like Radio-Craft and Radio News from the 1910's up until around the 1960's. This one appeared in a 1936 issue. There were a couple companies (Sams Photofact, most notably) that sold packages of service data for all new domestic use electronics products, but smaller service shops could not easily afford the subscription cost, and the do-it-yourselfer was out of luck because the manufacturers did not sell such data to non-licensed dealers. Today it is even harder to come by the information. Often, images of these radios can be found on websites like RadioMuseum.org and RadioAttic.com. Another great source is eBay, but usually those are not as photogenic because they are in need of restoration. 

Westinghouse Model WR 207 5-Tube Dual-Band Superheterodyne

 - RF Cafe

These values are measured from the point indicated to ground and are read with a 1,000 ohms-per-volt meter. The line voltage is 117.5 V. 'The oscillator plate is 170 V. "This value is measured across the filament terminals. The voltage across 'the speaker field is 70 V. To align the I.F. stage, set the receiver tuning condenser to minimum and adjust the oscillator trimmer for maximum response, then adjust the broadcast antenna trimmer likewise.

Be sure to choose the minimum peak capacity on the oscillator trimmer. The broadcast band is aligned with a 200-mmf. condenser in series with the antenna lead. Set the receiver dial pointer at 600 kc., and adjust the broadcast series padder for best response. Move the pointer to 1,600 kc. and connect the output of a service oscillator to the cap of V1.

 - RF Cafe

 

 

Posted December 29, 2020

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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