JJ 12AY7 Preamp Tube The JJ 12AY7 Preamp Tube is a medium gain pre-amplifying double triode. The 12AY7 can often replace a 12AX7 in your amplifier and give you a rich, warm tone with lower gain of about 60% than a 12AX7. These tubes were used in many Fender Tweed era amps. Get the datasheet here.
