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Old 15th May 2007, 06:30 AM   #1
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Default Very high plate voltage EL34 amp

Does anyone know of any amps or has anyone ever built an amp that uses excessive plate voltage on new production EL34's? I am converting an amp that supplies 680V plates and 335V for screens. I plan to use a quad of them in pentode per channel with a load of 4.5k-6k ohm, but I'm concerned if the (new production) tubes can take it, and also if they will sound OK running at such low current.

thanks,
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Old 16th May 2007, 02:43 AM   #2
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Nobody has any insight? Anybody ever use or build an amp with over 600V plates for new production EL34s? I was looking to use JJ/Tesla...anybody know if they can handle it?
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Old 16th May 2007, 03:49 AM   #3
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They claim they can.

http://www.jj-electronic.sk//pdf/E34L.pdf

I've run them up to 500V in triode mode which exceeds its g2 rating without any smoke or flames.

Cheers,
Ian
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Old 16th May 2007, 05:19 AM   #4
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Ya know, I just thought of this -- BOI audioworks can match a set for a requested operating point. So, you could tell them you want to run them at 680V plate / 330V screen / I mA idle current (keep it within reasonable plate dissipation limits, of course), and they should be able to set you up with a couple quads tested for that voltage.

They've hooked me up with two very-well-matched quads of KT66s that I basically requested for use at max plate dissipation
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