Do you trust the shop who gave you the quote, or was this a manufacturer? Long ago I had one channel go out on my Rotel Power amp. I paid a local shop $20 to diagnose the problem. They told me that all the output transistors were blown and the repair would be $220 (only paid $400 years before). I called Rotel and they actually refered me to one of their techs. He said it sounded unusual and maybe I should send it to them. They charged me $75 parts and labor, not one transistor on the repair invoice.
That shop had a bunch of used stuff out front for sale. People decided it wasn't worth the repair and just left them there. I think I know why.
That shop had a bunch of used stuff out front for sale. People decided it wasn't worth the repair and just left them there. I think I know why.