I second using Stereo Exchange in Lincoln Square. I would've used Deltronics but their hours were too inconvenient for me. Dave fixed my Unico SE that was badly damaged in shipping after I bought it through Agon.
When I brought it in he handed me a screwdriver and told me to pop the lid while he kept working on some big child's toy made out of green plastic. Then he inspected the amp with me to point out everything that would need fixing - must've dropped it off of a loading dock! Great guy who put in lots of hours fixing it. Also, he insists on keeping amps for a couple of extra days to stress test the repairs.
When I brought it in he handed me a screwdriver and told me to pop the lid while he kept working on some big child's toy made out of green plastic. Then he inspected the amp with me to point out everything that would need fixing - must've dropped it off of a loading dock! Great guy who put in lots of hours fixing it. Also, he insists on keeping amps for a couple of extra days to stress test the repairs.