Damn, I spent a fortune on that amp, and the consensus seems to be that it was bad. That sucks.
I'll look for another one and see if it's any better.
-Jimi
Did you buy it used?
If you still have it, talk to @timowens - you could compare notes and determine if there is a difference, I'm sure he will help (if he still has his). Maybe if it really is defective, it can be repaired at a reasonable cost.