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RE: Is there any real benifit sonically between class A, AB etc...

Hi Tre'

I will have to concede that it may be hard to find an indirectly heated power triode with the beautiful curves of a 300b but I doubt that it has much to do with directly heated vs. indirectly heated. A 12AX7 has some very nice curves. Granted it is not a power triode but it is indirectly heated.

I'm guessing that power triodes were largely being displaced by pentodes and beam tetrodes as indirectly heated tubes were getting more common.

Phil


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