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One thing to try is an AGC override, as shown on page 6 on sams, this is easy and needs few items and clip leads. Shown below. If it helps get a tuned picture , it means AGC is the problem.
500k potentiometer, linear.
9 v battery.
Wire the battery to the outer lugs of the potentiometer.
Hook negative line to chassis, and wiper of potentiometer to test point A on chassis.
Start sweep from 0v and work up from there to see if it gets a reaction.
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