[sdiy] design experts

[Magnus Danielson]

From: metasonix <metasonix at earthlink.net>
Subject: RE: [sdiy] design experts
Date: Thu, 14 Aug 2003 18:23:07 -0700

> At 09:11 AM 8/14/03 -0700, you wrote:
> >So did someone run an experiment with doing FFT's on each
> >rectifier approach to prove one has different freq. content than the other?
> 
> Not me. Why don't you do that, Barry?
> Be the first to publish an article.
> 
> I have installed (lots of) FREDs in vintage hifi amps.
> Last year it was an old Fisher KX-90 tube amp. 
> There was about 5 mV of high-frequency hash in 
> the output with the old tophat rectifiers, mostly
> "inaudible"--with the FREDs it went down to less 
> than 2 mV. Yes, I would say the damn thing sounded 
> better too. But don't tell that to a old crusty engineer...

BTW, for anyone who hasn't done it, hook up your oscilloscope at the rectifier
to view the little ringing going on there... most amusing and not very stable
either.

Cheers,
Magnus