2. amps-preamps
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SS amps with little or NO feedback

I'd like to explore amps with little or no feedback.
Global feedback is a no-no but some feedback a stage at a time may be acceptable.
Any names to look for? Since I want higher power, class 'a' need not apply.

There are enough theoretical problems with my 'd' amp that I'm seriously considering a 'sidegrade'.
thanks for any leads.
magfan
stevecham
3,340 posts
 
conrad johnson
ngjockey
1,042 posts
 
If you're going to be influenced by topology and advertising slogans, may I also suggest getting a differentially balanced amplifier along with "NNFB". At least that will eliminate the second harmonic and leave you with primarily third harmonic.
unsound
7,343 posts
 
Ayre, Threshold.
chatta
314 posts
 
X2 on Krell amps.
ohlala
1,243 posts
 
Yeah, there is theoretical problems with everything that only money seems to solve (at least in advertising)! I have also been considering and reading about no-feedback designs(and may start another thread). I am not sure how to conduct a meaningful subjective comparison to more regular SS amps, though, unless I compared a lot of them.

A compromise of those amps to keep in mind is a high output impedance. People like Atma-sphere amps with Magnepan, so it shouldn't be a big deal for you, but the on-paper issue is a voltage drop to the speaker proportionally related by the calculated damping factor. Your speaker, of course is 4.5ohms, which is low but not really low. I am really just suggesting to be aware of that measurement before purchase.

Ayre is another company that advertises no-feedback amps, and Spectron has their ultra-fast control loop which may be interesting to you.
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