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RE: EL34 SE UL power amp with universal driver tube

Posted by Tre' (P) on November 20, 2024 at 07:14:29

In Reply to: EL34 SE UL power amp with universal driver tube posted by mwhouston on November 19, 2024 at 18:01:37:

"any 12A*7 can be rolled here"

In a circuit designed for a 12ax7 a 12at7 or a 12au7 would not perform properly without adjusting the circuit values. There are large differences in mu, plate resistance and transconductance between those three tubes.

I've always wondered why people contend that a circuit can use multiple different tubes without modification?

That belies the facts.

By the way, nice looking amp.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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