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Old 5th December 2009, 07:30 AM   #101
PMA is offline PMA  Europe
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Those interested in alternative output stages might consider the circuit I am attaching, but I am staying with 2EF output.
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Old 5th December 2009, 08:08 AM   #102
AKSA is offline AKSA  Australia
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I have considered something very like this OPS; Pavel, what are the advantages over the 2EF?
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Old 5th December 2009, 08:51 AM   #103
forr is offline forr  France
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Somewhat reminding Bryston output stage.
Needs matched beta of transistors Q5/Q7 and Q6/Q8, I think.
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Old 5th December 2009, 09:06 AM   #104
AKSA is offline AKSA  Australia
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Yes, very similar.... looks very good in simulation, with EC.
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Old 5th December 2009, 09:10 AM   #105
PMA is offline PMA  Europe
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Hugh and Forr, it resembles Bryston output stage, but the circuit is different. Runs nice in simulation, but there are thermal issues and switch-off issues, cross-conduction very likely above 20kHz.
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Old 5th December 2009, 09:12 AM   #106
PMA is offline PMA  Europe
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Quote:
Originally Posted by Ultima Thule View Post
And the show's on again... PMA don't go again for another tour de vacation in the 'sunny bin'!..
Don't worry Michael, I have realized.
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Old 6th December 2009, 07:32 PM   #107
PMA is offline PMA  Europe
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Quote:
Originally Posted by john curl View Post
I use an amp, almost exactly like this, as my principal amp in my video system. It works well for this application!
This is very true, John. And not only for this application . I am very satisfied with the sonic result.
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Old 6th December 2009, 10:09 PM   #108
john curl is offline john curl  United States
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I once was friends with a fellow designer, who designed the Radford solid state amps in the 1970's. His output stage was very similar to the latest one provided here.
He was very sure that he could meet any challenge in audio, but I reminded him that his output stage used as many parts a my whole amp. ;-)
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Last edited by john curl; 6th December 2009 at 10:17 PM.
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Old 6th December 2009, 11:33 PM   #109
Upupa Epops is offline Upupa Epops  Czech Republic
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Look to the future, John, not only to the history...take idea: the best amp will come past us...
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Old 7th December 2009, 01:03 AM   #110
AKSA is offline AKSA  Australia
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Was that Arthur Bailey, John? Does this design look like the one?

Hugh
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File Type: gif RadfordZDschematic.gif (50.2 KB, 749 views)
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