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RE: Different function of 12au7s and 2 12ax7s in amplifier.

TGT,

usually the sound character can be set by the first tube in the circuit, but not always. also depends on how much global feedback is used. If a lot is used, you may not hear much difference between tube brands of the same type.

Just going from memory, the
12AX7 was 99 db of gain
12AU7 was 20db of gain
12AT7 was 60 db of gain
12AY7 was 40? db of gain.

since NOS or UOS (Used old stock) US made input tubes can still be obtained pretty cheaply, you might want to try finding some US made RCA, Sylvania, GE made tubes of the same type and experiment there first.

happy listening,

J

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