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I know of none either, having been in the trade for some 30+ years. I do remember being quite surprized at the 'radical' new concept of scan-derived power supplies when they started appearing in SS sets.
The concept made total sense. A 'hard switch' (a power transistor or SCRs) driving the flyback enables a much 'stiffer' supply than could be driven by a lossy, heat-dissipating tube.
The biggest problem though, was the rate at which the transistors and SCRs would blow out (which kep us busy).
Last edited by old_coot88; 10-30-2014 at 01:29 PM.
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