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Posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
Stewart Pinkerton
 
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Default The Catch-22 of Negative Feedback aka NFB

On 24 Mar 2006 00:46:36 -0800, "Andre Jute" wrote:

I must say, Wilson, I don't understand why you're getting your knickers
in a knot. You're like those bolshies I used to know who claimed that
anyone who wasn't willing to kill for "socialism" was only play-acting.
Are you really claiming that someone who merely uses the NFB he finds
lurking in DHTs can't belong to the club until he repents and uses
excessive amounts of loop NFB? Are you really claiming that the use of
lots and lots of NFB is a prerequisite for good audio design? Are you
really claiming that because a little NFB is a good thing, an unlimited
amount must therefore be better, and an infinite amount best of all?
Seems a bit immoderate to me, old chap.

Your hysterical belief that I am "against" NFB is the product of your
unsophisticated literal-mindedness. There is no reason for NFB to be an
act of faith, like an on-off switch. For the record, quite contrary to
your silly claims about what I said, I believe the little NFB that
occurs naturally in triodes and in certain conservatively sanctioned
traditional topologies are A Good Thing. To avoid giving you another
apoplectic fit, I shan't repeat what I think of the excessive amounts
of NFB required to make transistors work at all.


As ever, you have no idea what you're talking about. A modern power
transistor such as the 2SC2922 is *more* linear than a 300B, *without*
any feedback. With feedback, due to its gain of 100, it can achieve
linearity far beyond the wildest dreams of the 'ultrafidelista'.

That, of course, is why KISASS will kick the ass of KISS any day of
the week.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

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