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That box is an interstage audio transformer. P goes to plate of the first audio, + to B+ for that tube. G goes to grid of the second audio, F to its filament. With power off, check the two windings with your ohmmeter: P to +, and then F to G. Neither winding should be open. Often they are. There are small modern replacements to hide under chassis if the transformer is open. There is also a work around to get it going temporarily if needed.
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Reece
Perfection is hard to reach with a screwdriver.
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