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Is the Cartridge current manufacture or new old stock that may have been sitting around? Any original style cartridge for that player probably hasn't been made since the 1970's at best so they can still be bad just from sitting around.
Try this, when it fades out, touch the wire connectors at the cartridge with a finger, one at a time and not touching anything else that's metal (to avoid getting shocked) you should get a loud hum if the amp is working.
the dimmer tube is probably not a concern, all tubes do not glow the same.
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