Holy Smokes its the same amp as my 1990-91 edition of the Fet-Valve 500, which I purchased from Frank, as his daughter was bringing it home from school in Montana. Was supposed to be bench tested before it was shipped off to me. Recall getting it UPS a day or two later. The amp never did sound correct to these ears, and I should"ve sent it back for repair or refund, my bad. After I sold it and moved on, the guy who bought it said he sent it in to get checked out and it was found to be way out of spec. Repaired and he was pleased. But this was supposed to be done for me, instead of boxed an shipped out. AVA lost a customer in me after that. Now I know sometimes things happen, and I dont hold grudges, I"m just stateing facts. Onto the new amp, C"mon guys, with all the open realstate inside I would"ve liked to see the Heatsinks/boards on either side, freeing up the rear panel to allow simple access. That rear heat sink is just a pain to navigate around period. I found this site as I go into the VMPS circle, own the RM-1s. Also have Salk Loudspeakers one county over in Oakland County, MI. ... An American Audiophile who prefers American made audio!