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if the static is only audible on the FM band (assuming this has one) then the problem can sometimes be the brass or copper ground couplers that rest against the tuning capacitor shaft right where the shaft passes through the bearing. The contact becomes intermittent due to corrosion on the contact point - which can be easily cleaned and remidied through the use of a teflon lubricant like zep45. Only use a drop or two on each contact point and work the tuner back and forth.
If its only on the am band and or part of the FM band doesn't work then I would suspect a short as mentioned above.
Good luck.
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Jordan
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