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If that is a split chassis set, spray the tube pins with contact cleaner then insert and remove the tube from the socket a few times. Put some contact cleaner on a Q-tip and with the tuner cover off wipe the electrical contacts, turn the knob and repeat. If still bad try bypassing the tuner's Balun.....Beyond that are resistance and tube subbing, and if all else fails a new tuner.
I have a split chassis parts chassis I could pull the tuner from if needed.
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