I have a low gain (12au7) which I converted from a high gain 12at7 board a while back. I recently built some new speakers and they are MUCH more efficient than my last speakers. Sensitivity is about 105db. So, now I hear noise (sounds like tube rush).
Just to see a bit where it's coming from, I removed my 12au7 tubes and turned on the amp - very quiet! Nice.
So I guess my question is - how do I get the VTA 12au7 ST70 to be more quiet with these high efficiency speakers?