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RE: Schottky

IIRC, the UF5408 is somewhat faster than the GI856. Mere speed is not the only puzzle piece. AFAIK, FREDs are the fastest PN junction diodes, but not necessarily the best sounding. The character of the reverse recovery spike and the ease of suppression also matter.

Jim uses series wired GI856 pairs and a single film snubber cap. in the PSU of a H/K Cit. 2. The result is excellent. Of course, the low DCR choke after the doubler stack definitely contributes. A "hash" filter, made from "RF" parts, located between the doubler stack and the main filter choke yields an additional slight improvement in background "blackness". The "hash" filter kills crud from 3 potential sources: AC mains "hitchhikers", SS diode switching noise, and ripple overtone energy associated with the large valued doubler stack capacitors.

Eli D.

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