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Nice set. Dusty, but looks restorable.
The blue "can" connected to the base of the picture tube is a "booster" or "brightener" transformer, usually installed to coax a few more months of life from an aging tube. The tube may not be all that bright at this point, but might benefit from careful use of a CRT rejuvenator machine. To properly test it, you need a CRT tester/rejuvenator, or a standard tube tester with a CRT test adapter.
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