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RE: Need To Develop A Short List Of Tubes For a BHK Pre Amp

"Need tubes for the pre amp, which can take 12a*7 family or 6922/6dj8 tubes."

What is the actual preamp? (You don't mention a name or model number)

A preamp that advertises that you can plug a 12AX7 or 12AU7 into the same socket is either going to be running the 12AX7 into the ground or running the 12AU7 so lean that it will sound like garbage. One caveat is that if the preamp in question has a bunch of dip switches to adjust the operating parameters (actual resistors in the circuit), then these tube substitutions could be done with more success.


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