I have this old NAD 7020 up in the attic. Before I toss it, I want to ask if I could repair it myself. The problem is that it has nearly no sound output at all. I have to turn up the volume way up high, and then I hear only a distant-sounding signal through the speakers. It sounds like line-level output to me. My first thought was that the amplifier had worn out after many, many years of faithful service, but my reading online leads me to wonder if other, less expensive items have failed. I have read that capacitors have a tendency to quit after a few decades. I am not much of an electrician, but I think that I could replace a capacitor (if I knew which one!) With a unit this old, I am not sure that I want to spend the money to get a competent technician on it. Does anyone have any suggestions on how to get the amplifier back on? TIA