mono amps one weaker than the other ????

have you switched the monos themselves? sounds like a very odd problem to me. you might wanna check with deja vu if you haven't already.

i did call deja vu and they indicated a driver tube more than likely the issue, i hooked the amps back up as they were and the issue was still present,so i pulled the drivers cleaned the pins and switched them sound leveled out again and i have a good image again, still odd how a tube can play great for 2 hours then all the sudden loose contact or what ever and play at half volume

Joe

Switch the tubes between the amps, and see if the problem follows. If it does(assuming you have the Conquests): switch the pair of 6SN7s, and see if it follows again. If not try the 5U4Gs(A rectifier going south would certainly lower your output levels). Of course, it could be an output tube.