Classe has no archives and there's very little info out there. I know its 75 watts with an input impedance of 75k. Also, discrete transistors (either Toshiba or Motorola, they used both at diferent times) tied to the voltage rail in back with the heatsinks.I'm going to post for a copy of the manual elsewhere. No way I'll open it up; you'd never believe it's not new and I'll keep it that way to trade up down the road.