Hello all. I just got a Yamaha Ax-500U integrated amplifier for $25.00 the other day. It has been in storge for years. It really was not working when I got it and only the cd and cd direct was working. Well after looking over everything the problem was the guy never used the Accessory from the send to the receive in back. The guy never hooked up the protection plugs as I call it. Now everything works and I am happy. I have the box and manual as well. I feel very blessed.😀 Very powerful. jm