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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp posted by Ray Moth on April 16, 2007 at 15:45:07:
On second thoughts, I doubt if a pentode LTP splitter would necessarily benefit from a CCS in the tail (despite the fact that one of Gary Pimm's variations on his 47 PP amp used it with a pair of 6AU6s). The problem, as I see it, is that both plate and screen currents go through the cathode, so having a constant total cathode current does not guarantee that the sum of plate currents will always be the same, because the screens could also vary.I suppose this problem might be overcome if the screens were fed from independedn matched CCSs. This should take the screen currents out of the equation. I was going to check if Gary Pimm did this but, of course, his site is no longer available, so I can't. It does seem a heck of a lot of trouble to go to, though, just to use pentodes in an LTP!
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- Answering one's own post may be a sign of madness, but here goes . . . - Ray Moth 00:38:04 04/22/07 (0)
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