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Basically, signal capacitors block DC voltages, and pass AC voltages. The voltages could be in the form of RF or audio signals. Electrolytic caps are part of the filtering circuit, and help convert the pulsating DC from the rectifier, to smooth DC. If you don't have much experience with electronics and in particular tube circuits, you might want to get a few books and study up on the subject before you start trying to restore this set. There's a lot to learn and some time spent in learning what parts do, and how circuits function, will pay off in the long run. You'll have to shop around and see what the speaker reconing will cost. Don't know myself. And there's a lot of other guys on this site who have great advice on redoing the cabinet. As I said earlier, don't be in a rush. Worry about the cabinet and speaker later. Does the speaker rattle when you play the set?
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