Single ended amp from class A push-pull - diyAudio
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Old 12th October 2007, 06:02 PM   #1
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Default Single ended amp from class A push-pull

...it is amazing how tubes can fool human perception!
During the last concert I've discovered one 6P3S in my amp has glowing anode. It turned to be I've overbiased them, so evaporated anode metal shorted the path between grid and cathode so only -1V of bias voltage left in one shoulder (2 tubes in parallel)... Actually, it was a single ended kind of an amp as the result with much less output power and higher distortions if to measure them, but people kept saying it sounds brilliant... Go figure...

...so... what if to use a push-pull transformer with a FET current source?

The cheapest way to get a decent class A power amp!
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Old 12th October 2007, 07:56 PM   #2
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Twice as much power and still giving SET sound using a P-P transformer:
(could just skip the cascode part and use a high voltage Mosfet like the FQP2N90)

http://www.diyaudio.com/forums/showt...668#post638668

Don
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Old 12th October 2007, 09:14 PM   #3
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Thanks Don; now I am going to try it intentionally.
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