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Cold won't bother it, just keep it dry. Brighteners were aftermarket add-ons. Not every set that has one really needed them, so maybe you will luck out.
Those are fairly common tubes; you can probably find a good used or NOS crt for not too much money, though shipping can be a problem.
I had a later model DuMont something like this and it was built rather simply. Probably not too hard to work on.
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Bryan
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