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Old 18th September 2005, 04:52 PM   #11
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anli:
Agree

Better to do something about the distortion of the main signal
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Old 18th September 2005, 05:09 PM   #12
PMA is offline PMA  Europe
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Better to compare 2 designs, with similar distortion for higher power (order of watts and more), and differing in low-level distortion (order of 10mW, 100mW). Try it
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Old 18th September 2005, 05:11 PM   #13
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PMA:
Agree
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Old 19th September 2005, 01:10 PM   #14
tlf9999 is offline tlf9999  United States
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Quote:
Originally posted by PMA
Better to compare 2 designs, with similar distortion for higher power (order of watts and more), and differing in low-level distortion (order of 10mW, 100mW). Try it
one way to do that is to compare an amp working in AB/B (with bias) and the same amp working in C (without bias).

Either Self or Douglas mentioned somewhere that in a Class C, the cross-over distortion doesnot go up when output power goes down - totally counter-intuitive and I am not sure if I will buy off of that.

it shouldn't be that difficult to do, right?
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Old 19th September 2005, 01:13 PM   #15
PMA is offline PMA  Europe
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I have already compared B, AB and AB with error correction. For me the question has been answered.
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Old 19th September 2005, 02:00 PM   #16
anli is offline anli  Russian Federation
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Quote:
Originally posted by PMA
I have already compared B, AB and AB with error correction. For me the question has been answered.
Pavel,

Have you rejected class A topology as a decision of first watt problem?

P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png
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Old 19th September 2005, 02:53 PM   #17
PMA is offline PMA  Europe
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Quote:
Originally posted by anli

Pavel,

Have you rejected class A topology as a decision of first watt problem?

P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png
No, I have not. The class A is superior, but a little bit hot when designed for higher power.

I have reviewed your ftp, very smart and interesting circuits. I apologize for lack of answering, unfurtunately been too busy in my regular job ...
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Old 20th September 2005, 05:43 AM   #18
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Quote:
Originally posted by anli

P.S. BTW, have you looked at my amp? Final (soldered) version is here: http://gaydenko.com/um/schematics18.png

Drastwuj Anli

maybe you will write about its sound; only sharp/detailed or soft/relaxing?
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Old 20th September 2005, 06:40 AM   #19
anli is offline anli  Russian Federation
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Originally posted by padamiecki
Drastwuj Anli

maybe you will write about its sound; only sharp/detailed or soft/relaxing?
I'd say "detailed and relaxing" - it is balanced class A with very deep NFB (more than 90db in simulator).

I have very simple criteria for amps: it is possible to listen at high level and during long time without tiredness even if it is a listening of symphony orchestra.

OTOH, I have not a big practice in listening of plenty of other amps with different topologies.
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Old 20th September 2005, 06:57 AM   #20
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Quote:
Originally posted by anli

I'd say "detailed and relaxing"

OK

do not you have a problems with dc-offset?
Only the hexfets are on the heatsinks?
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