I have several Fisher 500 c 's and several of the smaller tube amps,I love them. I use a 500C in the shop with Cornwall 2's and have one in the living room driving Lascalas. Would recommend at the very least replacing the selenium rectififier and coupling caps. These are becoming very popular and the price of them keeps going up. When I first started collecting you could pick up a nice 500C for 250.00 now they are going for 375 to over 500.00.