This one is probably the best that I have found, with new Darlington packs replaced it's like new. I also have a Yamaha surround sound receiver. It cannot compare to the power and warmth of the 780. I have an SX-636 with a serviced amp... the only problem is the dial lamps are out on the left side... look like they are tough to get to. I know they are fuse type lamps, is it a hassle to remove the faceplate and knobs to replace them? I have the lamps but just want to know the right way to get to them...