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That's weird. I changed a handful back in the day, and maybe "handful" was actually two or three.. I don't see how anything on the chassis could cause that cap to run hot.
IIRC, that capacitor is across a bucking winding and is meant to tune the transformer. I'm wondering if isn't a winding inside the transformer that might be shorting after the transformer gets hot (which those things do, even with no load).
Another possibility might be too much AC input? The way those were explained to me was that those transformers saturated at about 90V, and everything above that was wasted as heat. Not very efficient but foolproof regulation: they would output full voltage at 90V and could not go any higher despite the AC being increased beyond 90VAC. Back in the 70s, the AC was probably between 110 and 118V, but today, we can get up to 125VAC in some areas. As I type this, I'm getting 122.6 out my outlet.
This might be enough to aggravate the system.
What I would try is a motor start cap of higher voltage and mount that. There's plenty of room in there for alternate mounting if you need it.
John
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