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I'm going to take a guess that this coil I have circled is the actual Horizontal Oscillator frequency adjustment, if that tube next to it is the Oscillator I'd be fairly sure of it. It could also be the width or drive coil possibly.
It wouldn't hurt to give it a turn one way or the other and see if the picture falls into place.
The AFC will also affect the frequency but I believe the other one is the one to be concerned with for now.
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