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So, how far back does the use of a flyback based high voltage go?

April 26, 2017based Flyback high voltage

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So, how far back does the use of a flyback based high voltage go?

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(From: Henry van Cleef (vancleef@netcom.com).) A flyback HV supply was a feature of the 1946 RCA 630 and GE 801 sets. They used either an 807 or 6BG6 horizontal output tube, 6W4 damper, 1B3 rectifier. The prewar TV’s (yes, TV’s were made and for sale before the NTSC standard was approved in 1941) generally used a 60 Hz. transformer and 2X2 similar to circuits used in RCA and Dumont oscilloscopes of the 1930’s. Zworykin/Morton “Television” (Wiley, 1940) has schematics and a project home-brew TV set using an 81 tube for the HV off a standard power transformer. Of course, to follow your way around this book, you have to know vacuum tube theory and a lot of physics reasonably well, but it is an historical gold mine. (From: Brad Thompson (Brad_Thompson@pop.valley.net).) Some of the early TV sets used an RF oscillator to generate the high voltage for electrostatic-deflection CRTs: a typical tube lineup might include a 6V6 oscillator and 1B3 (or 1X2) rectifier.