Instead of first going "down the throat" of the tuner, i would loose-couple the genny (at the IF frequency) to the mixer/osc tube. Just tape a turn or two of wire around the top of the tube (or slip an ungrounded tube shield over it). Clip the signal lead to that and attenuate as needed. And see if the jacked condition remains. This would confirm that the problem is indeed in the IF strip and not 'upstream' of it.
You have subbed all the IF tubes and the mixer/osc tube, right?
Mal Fuller said:
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It will not be an alignment issue.
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Agreed 110%.