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Can't tell from that angle, but does it have a stack of plates with spaces in between? If so, it's a selenium rectifier. It would change line voltage AC to DC for use by the radio. If the radio hasn't been used much, it may still be good. If not, no problem: it can be replaced by a modern silicon diode which is very small like a resistor, and which costs only pennies.
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Reece
Perfection is hard to reach with a screwdriver.
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