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

Posted by Jim McShane on May 23, 2017 at 13:08:35:
12FQ7s are getting quite scarce. It would be kind of you to let the guys who need them have first crack at them.

Besides, the heater winding in the amp is a 6.3 volt winding - so a very minor rewiring is all that's needed to plug in 6CG7/6FQ7s.