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In Reply to: RE: safety margin posted by Lew on December 03, 2016 at 11:38:10
Schottky diodes do have less OOB EHF harmonics, yes. but that's not in the audio band.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Follow Ups:
Tim, I cannot tell you "why", except for spouting the known facts about switching noise, etc. But for years I used hexfreds in my home brew or tweaked commercial gear, when tube rectifiers were impractical. Then when Schottkys became generally available, I switched to Schottkys, went back and changed over from Hexfreds to Schottkys in a few preamplifiers and in my big OTL amplifier monoblocks. I know there is a lot of self-deception built into this hobby, and I am very much a believer in listener bias, but all of that said, I hear something less in the way of an "electronic" sound, for want of a better word, with Schottkys vs Hexfreds. Plus, they are no more expensive than freds in most cases. The difference is subtle but real to me. Schottkys are much closer to tube rectifier sound (whatever that is), too.
I will at some stage get around to revisiting the PSUs in my two * 'Once Were' LEAK Stereo 20s which have high storage PSUs. I will be looking at putting in chokes and PP filter caps. CLCLCC or LCLCC if that's sensible, and get rid of the Rs that are there now except for one bleeder R, IF my techie insists on one.And, I will put Schottkys in to replace the (R&C) snubbed SR diodes that went in in the 1990s. They certainly are measurably and audibly quieter than anything else around.
For me, the limits that valve rectifiers impose on the amount of energy a PSU can store make them unnecessary.
The hole where the GZ34 was in the LEAKs now holds a 470uf 400V, dark brown, low ESR Nichicon cap. One of 4 per chassis.
The very positive effects on bass sound quality and headroom from a high storage PSU applies to all amplifiers.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 12/04/16
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