aclac
Active member
HI, I started build G9 preamp, and wonder that can I use 12AT7 instead 12AU7 (I have one 12AT7- pair at home)? 12AT7 amplification factor is 60 vs. 12AU7 has 20. Does it need some resistor changes or is it already calculated so that amplification can't go too high? I think, that sound should be almost same, or...