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In Reply to: RE: The Schotky Cree diodes make a tremendous difference in every place I have used them. posted by Michael Samra on December 27, 2016 at 21:58:09
Mike, what's the deal with using the Cree ZRec SiC schottkys in series? You need voltage equalizing resistors selected to pass the equivalent reverse leakage current or something like that?Sonically, three different pieces of equipment I have used these in have a black background - very nice. But, wondering if in one case it might possibly add a little edge to the mids, but I am not sure.
I recall reading something at Vacuum Tube Valley a while ago where they seemed to favor schottkys
Edits: 12/28/16 12/28/16Follow Ups:
Schottkys have very low, almost non-existent, out of band switching harmonics. So, other than through a higher and very clean HT DC voltage, how can you 'hear' them?
IME the sound quality improvements from soft recovery (SR) quiet SS diodes in valve amps is the far higher energy storage you can achieve:- they don't have severe PIV limits and the HT is also higher.
The energy storage is a f'n of the voltage squared so added to 300V even 10 extra volts has a large effect.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
current output is a function of capacitance straight up. In this case, I=C*di/dt...more capacitance results in less change in voltage for any given signal.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Putting balancing resistors on series connected diodes is nothing new.They did this back in the 60s on the Allen Organ amps but you can use 1/4 watt resistors there.This is stock and needs rebuilding but notice the balancing resistors.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Without voltage equalizing resistors, there is CONSIDERABLE risk of cascading parts failures.
Eli D.
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