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Old 26th November 2009, 06:10 PM   #21
Mooly is offline Mooly  United Kingdom
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Originally Posted by PMA View Post
I have been considering that before I have chosen this solution. The main reason was that this shown here gave smoother distortion residual at high frequencies. Self's type II bias gives a bit lower distortion, but more high order components. That's the main reason why I made it this way (type I by Self).
Thanks Pavel... that's interesting, I haven't the means to measure distortion like that.
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Old 26th November 2009, 06:11 PM   #22
Federmann is offline Federmann  Czech Republic
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The amplifier has a high current input circuits, no local feedback, which deteriorated characteristics, that I like. The results are indeed excellent.
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Old 26th November 2009, 06:25 PM   #23
Federmann is offline Federmann  Czech Republic
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I am, well describe why it is important not noise, but the gain at high frequencies. I explained why the high current input circuits. I explained why no local feedback. PMA well studied my text.

Distortion is not the smallest, but listening is better than ever, congratulations.
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Old 26th November 2009, 06:28 PM   #24
Upupa Epops is offline Upupa Epops  Czech Republic
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Federmann, PMA can use higher rail voltage at VAS and efficiency rise to theoretical limit, it is not problem. If you don't understand what I'm talking, look at schematic of MY AMPS, which you have at YOUR PAGES...
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Old 26th November 2009, 06:31 PM   #25
PMA is offline PMA  Europe
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Yes, but here is a misunderstanding, this amplifier does not use MOSFET followers, so the Vgs drop does not count here. Please have a look at schematics in the 1st post of this thread. There is a plenty of voltage to feed Vgs.
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Old 26th November 2009, 06:43 PM   #26
Federmann is offline Federmann  Czech Republic
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Originally Posted by Upupa Epops View Post
… can use higher rail voltage ….. If you don't understand what I'm talking, ...

Thank you for repeating what I've written many times on their website.
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Old 26th November 2009, 06:44 PM   #27
Upupa Epops is offline Upupa Epops  Czech Republic
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Also with bjt followers you can to use higher rail voltage at VAS, here concrete 2xVbe higher, if you can to go at full efficiency of output stage...
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Old 26th November 2009, 06:50 PM   #28
Upupa Epops is offline Upupa Epops  Czech Republic
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And no local feedback at PMA's schematic, Federmann ? Really ?
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Old 26th November 2009, 06:54 PM   #29
Federmann is offline Federmann  Czech Republic
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And no local feedback at PMA's schematic, Federmann ? Really ?
In effect, all killing capacity, why are you asking when you read my site.
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Old 26th November 2009, 07:06 PM   #30
Upupa Epops is offline Upupa Epops  Czech Republic
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No Federmann, I see there ( at PMA's schematic ) local feedbacks - you not ?
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