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wrote:
Can you explain how a triode based amp can be free of NFB?

You've misunderstood. No amplifier can be free of negative feedback.
There is negative feedback built into many devices, including Directly
Heated Triodes, the most linear devices known to audiophile man
(duck!). There is negative feedback inescapably inherent in many
goodsounding topologies popular with the ultrafidelista tube
fraternity. (The ultrafidelista love me as little for saying so as the
cramped, unimaginative wing of the cost engineers love me for pointing
out that their beloved NFB has a downside. Read the outraged tone of
Arny's comments. The less intelligent ultrafidelista when they abuse me
for consorting, as they see it, with cost engineers like Arny and
Pinkerton, who to them are Beelzebub.)

My case is that one should choose devices which require the least
additional, added, fat and sugar, high cholesterol, nasty, sound
artery-clogging, negative feedback. Any added NFB is bad, but loop
feedback is worse than local feedback.

HTH.

Andre Jute

"Andre Jute" wrote in message
oups.com...
I agree with you wholeheartedly. I have been saying the same things for
years.

I'm starting to wonder if Arny isn't thick and sly rather than
intelligent and obstructive. The evidence is building. For instance,
how can a guy who tells the whole wide world he's a Christian active in
the affairs of his church, as Arny does, on the same day, and for years
on end, perpetrate the slimy immorality of Arny's viciously dishonest
debating tactics, amply demonstrated by Patrick's analysis of Arny's
reply to my NFB article in the current threads. An honest, intelligent
man would go nuts trying to reconcile Christian beliefs with such
deceitful behaviour. A fool would not notice that his expressed beliefs
and his actions are opposed to each other. Other fools on the tube
conferences often make the same mistakes of comprehension Arny makes.

Andre Jute

Robert Morein wrote:
"Andre Jute" wrote in message
oups.com...

Sander deWaal wrote:

Just look what Arny had to say to one of your posts about the use of
NFB ....the original was posted to RAO by our friend Brat Ludwig :-)

Ludwig is a thief. The material is copyright and clearly marked for use
on RAT only.

This was my reply to Arny. Your comment is invited:

The above reply by Arny Krueger is garbage. There is no legitimate reason
to
draw from other fields to either justify or demonize negative feedback.
The
question under discussion is negative feedback applied to audio
amplifiers.
These nonsequitur references are trademarks of Arny's dirty debating
tactics.

I will give the same answer I gave regarding turntable design. How good
an
amplifier is cannot be determined by looking at the feedback loop, or any
other single element of the design. The only valid test is how it sounds.

There seems to be some concern by hifi purists which is based on the
following:
1. The number of iterations within a feedback loop is infinite. How long
is
the total transit time, through multiple interations, until inaudibility
is
reached?
2. Feedback causes a relative increase in the proportion of higher
harmonics. There is no psychometric for this effect.

These two questions, which are, in fact interrelated, remain current
because
amplifier measurement techniques are not sufficiently valid to predict
how
an amplifier will sound. The only universally accepted fact seems to be
the
established threshold of harmonic distortion. The regimes of amplifier
operation are a multivariate affair in the extreme.