I have one driving a pair of small Klipsch KGs at work. Actually just died after a coworker left it idling for several days w/o realizing it. Wasn't anything I could see wrong (fuses good, no visual signs of failure, everything lights up, etc) so it's off being diagnosed now. Trying to decide if I should put $$ into a repair or snag something like an AU-317/517 as I have no use for the tuner section @ work. . .