Yesterday I was working on an old Sears Silvertone model 1474. A unique amplifier, two separate output transformers, two speakers, and a lot of bad leaky old capacitors (see photo below). In fact nearly all of these green caps were leaking and causing all sorts of trouble. It is fairly typical for old electrolytic capacitors to go bad with age, but somewhat more rare for coupling caps to go bad. For this brand of caps though, I have seen most of them fail.
Once I got it working right it is a nice amp. It has a loud full sound! (4 6L6 output tubes!).