RF Cafe Software
About RF Cafe
1996 - 2022
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 ...
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January 1939 Radio-Craft[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.
I have been scanning and posting Radio Service Data Sheets like this one featuring the Clarion No. TC-31, 5-tube, A.C.-D.C. superheterodyne 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. I usually attempt to find somewhere on the Internet of an actual existing example of the radios, but could not for the Clarion TC-31.
This set is designed for operation on 110 V. A.C. or D.C. lighting lines. If the set does not operate on D.C 'in several minutes reverse the plug. The attached antenna should be laid out on the floor or hung out of a window. It may also be attached to an outside antenna if one is available. No ground is required and no attempt should be made to connect one as this will result in blowing a house fuse.
Circuit: The receiver uses a superhet circuit. The tubes used are: type 6C6 as combined oscillator and first-detector; 6D6, I.F. amplifier; 6C6, combined second-detector and first A.F. amplifier; and, 43, output A.F. amplifier.
Aligning the Set: Only in rare cases will it be found necessary to adjust any trimmers. If the volume is low, everything else should be checked before attempting to align the set.
Posted February 2, 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 185 Radio Service Data Sheets as of April 12, 2017.