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On the American units they were 120/240v as well. They typically came wired for 120v. How they did it is to have 2 120v primary windings on the transformer. You would wire the two windings in parallel for 120v and you'd wire them in series for 240v. If there's only one winding on yours and no taps then your stuck with that voltage... you can test for correct input voltage by observing heater or b+ winding voltage.
I'd try to fix the cup like you suggest before replacing it.
Hopefully your power transformer is still good... lot of factors there worry me.
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