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RE: Questions about 6BG6G amp build (schematic) Grommes 216BA

"What about plugging 12FQ7 into 12AU7 sockets?"

That will work, if and only if the 'U7s are wired for "12" V. heater power. OTOH, the 12BH7 is 100% pin compatible with the 12AU7 and, as long as the doubled heater draw is OK, drops right in. While (perhaps) not quite as linear as the triode found in 'SN7s, 'FQ7s ..., the 12BH7 is much more linear than the 12AU7. IMO, the only audio jobs the 'U7 triode is suited to are "concertina" phase splitter and cathode follower. Inside the bottle, local, NFB saves the day, in those applications.

Eli D.

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