It's so hit and miss with stuff. Some of it's really old and works fine, and another one, seemingly identical is a corpse that is a parts donor. A friend of mine has a bunch of old transistor radios, and most of them work fine, nothing in the circuitry was ever changed in them. A couple have those weird CK222 transistors and they are noisy at this point, but most of the issues with the rest of them are rotted speaker cones, something easily fixed in a few minutes. Some have had the volume pot get scratchy, but I can't think of any that wore out. Since he has Parkinson's, I'm the one who works on them at this point. I did a half dozen speakers about a year or so ago. Some of them have the nail polish on the speaker screws, which makes it more of a hassle than need be.