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There was one Philips tuner from the 80's that had a problem with the PLL chip failing. They seemed to have near 100% failure, so I wouldn't trust a used tuner. The tuner I'm thinking of was about 3"x5" and 1" thick and would be soldered to the main board. I seem to remember that there was a green label with the part number glued to the tuner.
If that sounds like the tuner in your set, post back and I can provide more information. It was possible to replace the PLL IC with a substitute that was much more reliable. The PLL IC should still be available, but the entire tuner for such an old set will be hard to find.
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