The carpathian, yes, 12AU7 and 6 or 12v FQ7 are interchangeable, but you have to choose the version of FQ7 that matches the available filament voltage. Same specs for all other parameters, more or less.
A day doesn’t go by where I don’t see an ad for the tubes or the equipment they sell. I also tried to find out where their stuff was made and nobody will say for sure. Though they are very generous. You can get 5% off your first order!
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