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Posted: Fri Apr 11, 2008 8:59 pm
by cob666
I have an AD30 single channel head that has a 12AT7 in the preamp socket. I know that the impedance is different than the 12AX7 so should I be using a 12AY7 (which has even less gain) or find a NOS 5751.

So, is the 12AT7 going to cause problems?