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Welcome to VK.
I read your thread on AK and saw the pictures (I'm a AK/VK member that spends more time on VK). That set should be reasonably electrically restorable. Chassis rust like that is no problem you could leave it be and the set will be fine. The only time rust is a problem is when the metal turns to swiss cheese from it (at that point rare parts may be compromised). I've restored a few rodent condos, and as long as they have not chewed up the cardboard RF/IF coils/transformers there is little permanent damage they can do worth worrying about. Tubes for this era of set are easy to find if you browse the web, and some can be quite cheap. The caps should run you around 10-35$.
As for the speaker cone is it gone or just torn with a few holes no bigger than a a silver dollar? If it is the latter silicone caulk and coffee filter paper should be able to fix it. If the former test the voice coil and field coil, and if both are good look into having it re-coned (there are services that do it for ya). If voice or field coil are bad look for another speaker they are out there.
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