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a picture (or video better still) is worth a thousand words. The hardest part of diagnosing sets with out being there is trying to visualize the problem. Next biggest problem is not being able to tap around and adj controls.
All that being said if you think you have an agc issue you should look on the schematic for a small value eletro, like 5uf or so. they are often singles small round with red painted on on end. This generally manifest as overly critical agc (from blanked out signal to loss of sync with very little adj in between. I don't know if I agree with the prob as described as AGC.
likely issues are tuner (dirty) tube sockets (dirty) baluns (open or not connected right). I look to this for problems with poor video signals.
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