I have heard a couple of comments on the sensitivity of the gain control on the BBE T-MAX pre-amp. It seemed like the gain was very sensitive and easy to overdrive. I switched the 12AX7 tube out and put in a Phillips JAN 5751 (only about 70% of the gain of the 12AX7) and wow, big difference! The gain is much smoother and more managable. Much easer to set the gain when playing an 18v onboard pre-amp than with the 12AX7. Sounding very nice today thru a QSC PLX 3002 and a Bergantino HT210. Very nice indeed.