A classic David Manley design employing a quad of 807 vacuum tubes per channel for 125 watts/ch in ultra-linear mode, 60 watts/ch in triode mode. [toggle switches on front faceplate]
Those privy to the sound of the 807 will surely agree that they are really special.... akin to an el84 with 5 times the power. This is a neat piece that you don't see come up for sale very often and holds its value. The amplifier weighs in a 58 lbs.