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In Reply to: RE: red plates ... bob and weave ... posted by Tre' on September 24, 2021 at 06:59:09
3.9K is only a calculation, and it is correct
in that published distortion figures will
be lower than 2.5K on a 2A3.
2.5K does something better: at the cost of slightly
higher distortion numbers, it delivers what a 3.9K transformer
(on a 2A3) can't: a tactile feeling-- a direct contact with music.
Only two amp stages, and DC coupling also improve that.
Remember these amps were designed to LISTEN TO, not just
to perform measurements on. There is ZERO chance that a
3.9K transformer will deliver what we have. It will be a
bit cleaner, it will measure better, and 4K has been
tried. Also, 8 ohm speakers have been driven superbly
when connected to the 16 ohm tap of the 2.5K transformer.
The real question is always-- what is the DCR of the power
supply, and are its capacitors small enough and fast enough,
and are the power supply chokes low-DCR and low-inductance
enough so that short-term dynamic peaks are well reproduced..
The 3.9K output trans will handle short-term dynamic events
in a far less convincing manner-- we have experimented with 4K..
2.15K could be better yet. 2.5K is readily available and does
what it should do, musically, so we're very happy with it.
Harmonic distortion is nice to measure and theorize
about. Real life dynamics is something that is essential
to people who enjoy dynamic, complex music.
Speakers are the ultimate challenge here. They must
work, or you go to higher power. If H.F. radiators
have too little surface area, and try to fire from a tiny area,
then all forms of harmonic distortions must be lowered
to control the sub-standard tweeter's departures from
natural dynamic handling of a listening area..
-Dennis-
Follow Ups:
"Also, 8 ohm speakers have been driven superbly
when connected to the 16 ohm tap of the 2.5K transformer."That would load the 2a3 at 1250 ohms. You are free to like the resultant sound but just because you like it and call it "driven superbly" doesn't mean that those speakers are being driven superbly.
At 1250 ohms the load line for the 2a3 would be rotated towards the vertical and the harmonic distortion will be increased a lot. From 4.44% THD to 11% THD. "Superbly driven" is not a good description of what is really going on here. Distortion is not just a measurement. Distortion can be heard.
I think you like the sound of distortion. Your statement above indicates that you do.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 09/25/21 09/25/21
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre,
Remember that Dennis only listens to his amplifiers, the asymetric clipping is part of the sounds: It's amazing, it's the best there is.
Probably he could be presedent too
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Dennis,You are just a salesman trying to sell horse shit like grapes. I have heard salesmen like you many times and I don't believe a word of it.
Edits: 09/24/21
Nobody has ever asked you or anyone else
to believe anything.
What you got is an
honest discussion of why a
thing is done in a certain way.
Designing a system to SOUND LIKE the real thing
is VERY different from getting it to MEASURE like
the real thing.
The SOUND is done IN A ROOM, using human hearing.
The MEASUREMENTS are done with test instruments.
The assessments are made when a recording playback
agrees-- USING THE HUMAN EAR-- with the recorded
venue.
When industry experts HEAR the real thing in a
listening room, they know it and they understand it
when it happens.
No recording engineer who has acquired amps that
were built in the ways that are described-- ever
parted with them. 2 or maybe it's been 3-- audiophiles
have parted with theirs. Audiophiles buy and sell
every day. I have never met an audiophile who kept
a given system together for more than 2 or 3
years-- most change some important part of their
systems every few months.
That's anybody's right-- to do so. No opposition
from me.
But the vast majority of people who have built
systems the right way from the start-- aren't into
parts changing all the time, especially of amps &
speakers.
More than 96% of the amps I ever built in the ways described
in older posts are with the original owners. 100% have never had
a parts failure-- ever.
-Dennis-
And the horseshit continues.....
Dennis, read some of your colleagues' ads . Some of them look exactly like yours.
Never did the trick
Who knows why people like these amps. Sort of like John Hogan who used the same PP Webster Organ outputs for all manner of tubes from 2A3, 300B, 45 etc and people swore by the sound.
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