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Chances are it's the IF module, not the tuner. It's usually caused by bad soldering on one of the coils near the IF IC.
Occasionally, I've seen bad soldering in the tuner, but that's much less common. I've usually been able to fix those tuners by reflowing the solder on some (or even most) of the connections in the tuner. Start with the ground connections, then do more if that doesn't take care of it.
If you end up needing a tuner, I'm sure someone here can give you one. Sony only used a few types of tuners in that time period.
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