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Did you try replacing the mixer-osc tube in the tuner? If so, try several for one that performs best.
Also, if memory serves correctly, there is a "master" osc coil on top of the tuner. Tweak it ever so slightly after ensuring that you have a good tube in the tuner.
While it is normal for IF and tuner alignment to drift in an old set, the change is usually slight and not very noticable. If your alignment is far off, it usually due to a failure in the chassis or inexperienced hands trying to improve things.
Good luck!
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