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Pentode VS Triode

Wasn't it the Sakuma goal to preserve and reinforce the sonic integrity of a specific tube by using the same type as both driver and output? I don't see how that could take place with one tube in triode and the other in pentode. The two configurations don't respond the same electrically, and as anyone who has switched a 6BQ5 output stage between triode and pentode can attest, they don't sound the same. Are we certain the schematic you posted is the original Sakuma? In any event, it will be interesting to hear your opinion on the difference when both stages are either pentode or triode. :)

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