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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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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Colonial 31 and 32 D.C. Superheterodyne Receiver
Radio Service Data Sheet
September 1930 Radio-Craft

September 1930 Radio-Craft

September 1930 Radio Craft Cover - RF Cafe[Table of Contents]

People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.

The following announcement was posted in the September 1930 edition of Radio-Craft magazine regarding Radio Data Service Sheets:

"We are pleased to announce that RADIO-CRAFT has taken over the subscription list of 'RADIO SERVICE,' formerly published in Dallas, Texas. All subscribers of record to RADIO SERVICE will receive RADIO­CRAFT until the expiration of their subscriptions."

Colonial 31 and 32 D.C.

The Colonial "31 D.C." which has had very wide distribution, incorporates a number of unusual design features. For instance, volume is controlled by varying condenser C4; with the middle plate centered the signal is balanced out. An absorption loop (LI C) improves the tuning characteristic. The cable color code is as follows: 7, yellow; 1, maroon; 5, black; 2, blue; 6, red; 12, gold with black tracer; 9, black with red tracer; 10 red with black tracer; 3, green; 4, 8 and 11 are not used. VI, V2, V3, V4 and VS are '26 tubes; V6, V7, are '71As; while V8 is a 110 V. "miniature base" 15 watt lamp ...

Colonial 31 and 32 D.C. Superheterodyne Receiver Radio Service Data Sheet, September 1930 Radio-Craft - RF Cafe

Colonial 31 and 32 D.C. Superheterodyne Receiver Radio Service Data Sheet, September 1930 Radio-Craft

 

Posted July 4 ,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 156 Radio Service Data Sheets as of December 6, 2016.