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RE: can i sub a 12ay7 for 12ax7?

Schematic please! When GNFB is employed, the overall gain of the circuit is controlled by the feedback resistors, not the gain in each stage.

"Hair trigger" volume controls are a fairly common problem. You can "pad" the I/P signal down, with a resistive voltage divider, either in the power amp or the preamp. Sometimes, individual dividers on each I/P, in the preamp, works out very well.


Eli D.


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