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I have had several cases where volume controls went open and I had to replace them....sounds like maybe the carbon track or wiper is open inside the control. First thing I would do is put the ohmmeter on the control (disconnected from the circuit) and check from wiper to each end terminal and across the end terminals.
It will probably be harder to replace the control on a radio like this as opposed to on, say a 1940's console radio as the shaft may be insulated to avoid a hot chassis shock hazard and also it may be a half-moon type to fit the knob.
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