So, what music are you listening to now?

[bobabode]

Originally Posted by icenine

You using those in place of the 12AX7s?
sorry for the dumb question.....

I may try that on my 175 amp.

The amp150 biamp mono circuit wasn't designed use the 12AX7, it uses the 12AT7 for frequencies below 1100hz and 6AV6 above as preamp drivers.

AFAIK the 12AT7 isn't a drop in replacement for the 12AX7 but that may depend on the circuit.

Maybe Steve will chime in here?

No worries on asking questions. As they say, the only dumb ones are those that go unasked.