For several years I thought it was failing. It would have a low hum. It magically "fixed" itself when I removed the cassette deck I had directly above it. A bit of interference going on, I guess. Some of the lettering is gone from around the knobs and switches. It is a bit dusty, which is probably not good for it. I replaced one of the power tubes 20 years ago or so. My BIL also has a Scott Tube receiver, but I do not know what model.
I guess it is safe to say I am not an audiophile.