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In Reply to: RE: There you go again.......... posted by tube wrangler on June 02, 2012 at 11:03:01
"(1) Conventional tube amplifier technique chooses cathode bypass caps by their Micro-Farad values. I choose them according to measured and listened performance under actual musically driven conditions."
The value necessary to fully bypass the cathode is a matter of math. The value you have chosen does not fully bypass the cathode. This make your amplifier, to use your word, "perverted". Not only will the frequency response be "off", the phase response will be off as well.
(2) A high impedance driver is not a problem in this design because the HI-MU driver chosen is far more than capable of driving any good 2A3 vacuum tube way beyond the levels that this design requires."
The high impedance driver is, by your own admission, a problem. You said it "starts to roll off at 15kHz". This makes your amplifier, to use your own word, "perverted". Not only will the frequency response be "off", the phase response will be off as well.
I didn't say anything about a three stage amplifier. Most of the rest of your post is a good example of you not addressing the questions and going off talking about other things.
You have done it again.
I didn't/don't assume anything. If the driver is not/can not fully drive the Miller that's a problem no matter what the rest of the circuit looks like.
If the cathodes are not fully bypassed that's a problem no matter what the rest of the circuit looks like.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Too many "IFs"!
---Dennis---
Those are not "Ifs".
Your driver can not fully drive the Miller by your own admission.
The cathodes of both the driver tube and the output tube are not fully bypassed.
No IFs.
You are doing the very thing you argue against. Making designing an amplifier that is perverted.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
This message has been moved to a more appropriate venue .
Disagreed.
---Dennis---
Too many bases not covered in your design.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/02/12
I fully and completely disagree.
---Dennis---
You disagree with yourself?
You said that your amp starts rolling off at 15kHz.
The cathodes are not fully bypassed. That's just a fact.
If you disagree, show the numbers, show me wrong.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
All the amps I've owned before my SET have been flat from 20-20K with distortion well below 1%. None sounded nearly as good as the SET which doesn't have "the numbers".
If Dennis just said that his amps sound good I wouldn't say a thing.
But instead look at his response to your post,
"OH! But it DOES have numbers. It's been at University E.E. labs where it astounded their engineers."
With undersized bypass caps and a driver that even Dennis admits does not fully drive the Miller capacitance of the output tube, how can his amp have good numbers?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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