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Old 8th November 2010, 01:38 AM   #1
chrisb is offline chrisb  Canada
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Default screen supply for Simple PP Pentode mode?

Clearly the question will demonstrates my ignorance of the subject, but here goes:

I'm down to the short strokes on a Simple P/P ( EL84) amp, on which I'm recycling an old pair of Scott LK48 OPT. The last DIY project these were used in was in triode mode - which sounded fine, but I'd like more power this time around. They don't have a U/L tap for screens - what would be a simple way to derive this supply? (at least I knew better than to ask "the best"? )

thanks
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Old 8th November 2010, 01:48 AM   #2
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With your 272HX the screens can be operated at full B+ provided decent tubes are used. This can be accomplished by installing jumpers in the green terminal blocks along the back of the board from the screen terminals to the B+ terminals.
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Old 8th November 2010, 06:24 AM   #3
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by tubelab.com View Post
With your 272HX the screens can be operated at full B+ provided decent tubes are used. This can be accomplished by installing jumpers in the green terminal blocks along the back of the board from the screen terminals to the B+ terminals.
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