It was being used with a Phase Linear 400. That's 200 wpc. It works just fine. I can't get over how direct and clean all the circuitry is. Betts and Bozak really were top of the heap.

I have to go out, when I get home I'll give it a whirl. I'm hoping I've found "the one". Alot of old school audiophiles say that this unit and the 909 were better than Mac units of the time.