There could be an issue with the pv 12 selector switch that you use to go from tuner to CD, then back to tuner. It could just need its contacts cleaned or if it has been used a lot over years, the selector contact could have developed a flat spot from wear. If that's the case you would be looking at having the selector switch replaced. To diagnose the issue, try working the selector switch and see if you hear the static as you toggle from one source to another. Again...this is a possibility not in any way a certainty.
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