Hi all, I just bought a pair of Auditronics Preamp/EQ's from the grandaddy or whatever the hell it's called console. They're already racked up and ready to rock, with a fresh recap. I'm curious if anyone knows much about these? I've heard that putting the John Hardy 990c op-amps will make them sing, but don't have much in the electronics skill department. Does anyone know if upgrading to the 990c op-amp is as easy as popping the old out and soldering the new in?? Anybody have any modification suggestions? I'm looking for very easy modification advice. Also, does anyone have the schematic for these channel strips? Thank you again, this forum is fantastic!