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In Reply to: RE: 300b set versus 300b parallel set posted by Larry I on May 26, 2017 at 05:38:48
I knew that could happen in theory, but i think that this is the first time I have ever read about such an experience, esp. on an AN(UK) amp. All of my 2A3 and 45 amps have just a single output tube.
I do have a pair of Class A triode-wired PP mono amps. Of course PP will always need 2 tubes per channel. But both monos have a balance pot. I wonder if that would work in the case of parallel SET to even out the balance?
Could you not just flip the tubes every three months from left to right and right to left to even out the wear?
No, the stronger tube will always "current hog" regardless of position.
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This assumes that it is actually a real effect. So far the 'current hog' stories have not quite been what I'd call air tight.
For the usual A1 cap coupling, the grid circuit gets to be a significant load, especially if you try to make a 10W amp out of 45's.
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