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On a radio this old, there could be slight corrosion on tube pins. Get the pins wet with cleaner and then insert/remove several times into each socket to improve connection. This might be the only problem. You'd have to pull the chassis to check the tuners.
Also, the piano-key switches on these radios need cleaning: spray, work switch on/off several times. Again this is an out-of-case operation.
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Reece
Perfection is hard to reach with a screwdriver.
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