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RE: KIS design

I'll go even further. Use high PIV Schottky diodes in the doubler and SS rectification is better in all categories, except the "SOFT" start damper diodes offer.

Acceptable regulation requires huge value caps., in the doubler stack. No vacuum diode I'm aware of can operate under those conditions. Large doubler stack caps. equate to tiny conduction angles. Tiny conduction angles imply lots of high order ripple overtone energy. Therefore, the low DCR choke and (perhaps) additional "hash" control measures are highly appropriate. Schottky diodes ensure that SS switching noise can't sneak into the amp via heater windings, as the noise doesn't exist to begin with.

BTW, 1 H. is plenty for that low DCR choke. Remember, the primary target is "hash", not the ripple fundamental.

Eli D.


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