Re: valve amp power output


"west" <nospam@xxxxxxx> wrote in message
news:YEH6i.51584$UD2.14268@xxxxxxxxxxx

Professor, please expand on this statement of yours. I have an idea but
want
to hear it from you, if you don't mind. Thanks.

Its always much better to have a quad of EL34 at Ea = 400V rather than
have a pair
of KT88/6550/KT90 to do the same watts at Ea = 600V.

Hi West. You can use pair of KT88s with B+ of 600V and get 100W
from them at about 0.3% THD. New production KT88s don't last too long
in that kind of application.

You can, as I have done in my 50W amp, use four EL34's in push pull
parallel, and get 50W with the same distortion as one pair give at 25W,
i.e. 0.1% The only drawback is that the heater supply requirement is
doubled, but the B+ stays at a very sensible 425V.

See:
http://www.kolumbus.fi/iain.churches/Pics/HomeAudioSystem/C50_002.jpg


Cordially,
Iain


.

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