1996 - 2016
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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May 1941 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.
This Radio Service Data Sheet for the RCA Victor Model VHR-307 Home Recording - Phono-Radio Combination (Chassis No. RC-555) was published in the May 1941 issue of Radio-Craft magazine. It was quite a work of electronics art for its day, especially with incorporating a recording unit. We take for granted today the very simple matter of recording voice and music today with miniature, inexpensive, maintenance-free recording and playback equipment, but in the early 1930s the available media were wire, magnetic tape, and phonograph records. Phono recorders actually cut the audio bumps into the groves. Magnetic tape was considered to be a military secret up through World War II. There is an episode of M.A.S.H. where B.J. Hunnicutt receives a record from home of his wife and daughter, indicating the technology was still in use in the Korean War era. The German company BASF, familiar today for recording media (although they spun off the magnetic media group into EMTEC in 1996), pioneered the technology. BTW, you can still buy vinyl record cutters.
Posted March 20, 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.