I agree with Cornfedboy. I have owned this amp for eight years and it is real stable. Recently developed a sizzle in the left channel, but a quick call to Boulder Amps connected me with their tech support guy, who diagnosed the problem immediately. Boxed up an eight year old amp, sent it back, and they replaced the caps, and shipped it back for free. Incredible service!! Have since bought another one, and am running them mono (as they were meant to be)into Hale T-8's. Nothing I have ever heard sounds better.