I wondered why there were always so many ARC power amps on the trade-in shelves at Brooks Berdan Ltd. Sure, he was a VTL, Jadis, and Mac dealer, so there would be trade-ins, but why so many ARC? Brooks' tech Tom told me he was constantly repairing ARC power amps because when a tube blows in one of them it often takes with it some of the circuit board parts. The tubes aren't fused---ARC uses resistors and capacitors in that role!
Brooks preferred to sell the Music Reference RM200 as his $5k amp, with hand-wound transformers (the heart of any tube power amp), wound by Roger if you pay him extra! 100w/ch from a pair of KT88/6150/KT120 tubes per, power increasing with diminishing impedance, the opposite of a normal tube amp. It sounded very good to Brooks, and Fremer likes it enough to put it in Class A. And with it, no costly, frequent update/upgrades (or, as I like to call them, corrections ;-). Roger works on his designs for years before putting them into production.
Even if you really want a REF75, think about trying to hear the RM200. I love mine.