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I'd replace any tubes in the FM circuit. I've actually seen them test good in a tube tester but would not function in the circuit. Otherwise, you'll have to get a schematic and a multimeter and make some voltage checks. If this set does not have a power transformer, it will probably be a hot chassis. It would be best to plug the chassis into an isolation transformer. Otherwise, use extreme caution or you could recieve a possible lethal shock.
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