I am Offering a very nice, clean Phase Linear 4000 peamp in need or repair. I have spent over the last 3 years over $1000 on repairs. It powers on and plays in stereo on right side but not left, in mono both sides play. In 4 channel mode you get some low sound out of left channel. The tone controls on left side do not respond just stay flat. If you plug the inputs into LR & RR you get sound out of stereo on both sides but not in regular L & R inputs. I know it sounds confusing but I am trying to explain all that happening. It may be something as easy as cleaning controls but I`m not spending any more time and money since I own a few of these.The inputs are working, A few scratches on the case, otherwise excellent condition.