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RE: 12ax7, 12at7, 12au7 interchangability

Geary,
Much like many people I'm continuing the ongoing quest for that magic sound. I'm aware of the gain factor changes, maybe this is how I made a wrong turn somewhere in assuming the only difference between the three AU, AT, AX types was gain.

Sooo.. you're saying that a 12AT7 CAN be swapped into a 12AX7 circuit?

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