View Single Post
  #50 (permalink)  
Old March 26th 06, 03:41 AM posted to rec.audio.tubes,uk.rec.audio,rec.audio.opinion
Patrick Turner
external usenet poster
 
Posts: 327
Default The Catch-22 of Negative Feedback aka NFB



Trevor Wilson wrote:

"Patrick Turner" wrote in message
...


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.


You will find yourself arguing at a man who has a head full of solid
concrete.


**Really? Then, I take it, you approve of Jute's lies? That makes you an
idiot.


First of all, Jute's Lies as you call them are merely his opinion.

Its a free world and I tolerate opinions; I do not necessarily agree with them,
and
it is my opinion that your head is so chock full of concrete that you draw the
absurd conconclusion
that I am a fool because you have erroneously assumed I agree with all of Jute's
ideas without question.

I have heard Jute on all this several times before, and would be wasting time to
flame him about his opinions.

Jute uses and tolerates quite a number of different amplifiers which include SET
without added loops of NFB.
Jute is pro tube craft.

Now Trev, do us all a favour and just **** off out of rec.audio.tubes because
you come here with a hammer.
On your way out, leave your tube breaking hammer in the re-cycle bin.

Come back when you have something constructive to say about tube craft,
and can share our craft in a practical way ( build a tube amp, ok ) and share
the experience in a tolerant spirit.

Patrick Turner.



Trev will never see the whole picture, and has never designed or built any
amp in
the last 30 years.


**Wrong and irrelevant. I am discussing Jute's lies. That you approve of
Jute's lies says a great deal about you.

I try not to bother arguing the same old tired BS time after time.
He just likes hanging out in news groups and Bull****ting.
He has NEVER once contributed a single article of constructive advice on
tubecraft
at r.a.t.


**And why should I? Tube technology matured in 1966. There was nothing much
to be added beyond that time.




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.

If you think you can write a more compelling argument than I can about
the evils of excessive NFB, have at it. But every time I see you, like
the other techies you merely kibbitz what better men have written.


I am now doing 845 amps, two per channel for 50 watts each.
I expect music to be real fine. Damping factor good, noise low,
bandwidth wide, distortions negligible and maybe I can add 6db of global
NFB but
I doubt any difference due to some **added** NFB will be heard.

Trev has never done anything like this and simply doesn't understand.


**Anything like what? Be precise and relate it to my comments on Jute's
lies.


With 845, just no need for the 106dB of added NFB used in SS amps.
I don't care a bit about what Trev says.


**What do I say (WRT Jute's lies)? Be precise and relate his lies to your
own culpability in those lies.

--
Trevor Wilson
www.rageaudio.com.au