2. amps-preamps
  3. 1311300695

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
kijanki's avatar
kijanki
4,446 posts
 
Al - Fully balanced design has very high CMRR but I wouldn't care about small amount of sweet sounding second harmonic. I would be more concerned with unpleasant odd harmonics created by negative feedback.
onemug
784 posts
 
How about the Pass X series? Try for the X.5 if you do. They are cheaper ($ for watt) and more powerful than their XA series. They have a nice white paper about the Super Symmetry circuit here.

http://www.passlabs.com/pdfs/articles/susy.pdf

FWIW, I have been using their XA.5 amps for years on my Maggie 3.6's.
almarg's avatar
almarg
9,670 posts
 
Also, the Modwright amplifiers have zero global feedback, and by most if not all accounts are outstanding performers in their price range.

Best regards,
-- Al
atmasphere's avatar
atmasphere
12,077 posts
 
Kijanki, if it is a true balanced differential design the main harmonic created will the the 3rd, not the 2nd. All the even orders should cancel. This is true of tube or transistor designs.

kijanki's avatar
kijanki
4,446 posts
 
Atmasphere - that's what I said. I don't care if sweet sounding second harmonic is canceled (by true balanced amp) while it still might produce unpleasant odd harmonics. Main benefit of true balanced design for me is high common mode rejection - perhaps not worth increased cost.
More to discover