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In Reply to: RE: No feedback? posted by Paul Joppa on July 24, 2012 at 20:58:37
Yes, the MA-3 (and the MA-2 and MA-1, as well as the preamps) are zero feedback. The M-60 and S-30 employ 1 and 2 db respectively, but we have customers that have had us build them without any or switchable.
We probably ought to add the words 'zero feedback' to that page...
Follow Ups:
Is current feedback (degenerative feedback), feedback?
I think you meant no loop feedback.
A circlotron amplifier is two cathode followers, driven in antiphase----bridged.
A cathode follower has lots of current feedback.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I've been vociferously reading audiophile stuff for more than a decade and I can say this: Nobody I know of, be they designers, reviewers, or hobbyists, ever refers to or consider a cathode follower to be "feedback" of any sort. Indeed, when the word is used, it almost always refers to voltage feedback, and global at that.
I don't mean to be pedantic, but you started it. :)
Seriously, I kind of appreciate you keeping Ralph on his toes here, but, really, you're holding him to a "standard" that is really nothing other than your own. For what it's worth.
It is loop feedback that causes the issues I have described elsewhere, due to propagation delays in the circuit, regardless of the amp.
Degenerative feedback is different as it occurs in real time.
Thanks - that makes sense now.
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