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

Hi
It is impossible to say without seeing the schematic. As a gross rule of thumb, in many integrated amps changing the preamp tubes will have a little more effect than changing the drivers and the output tubes will have the least effect. But that is a terribly gross generalization and it will depend on the circuit. Also the initial quality of the tubes before you change them. There are many circuits where a 12bh7 can be used in place of a 12au7 as well, but without seeing a schematic it is impossible to know.

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