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How far off is the horizontal frequency? If you have wide diagonal lines, set the horizontal control to mid range and adjust the horizontal frequency coil on the circuit board a bit to see if that will lock it in. If the frequency is far off then start by recapping the entire horizontal section. If it is not working correctly that can reduce all the high voltages. I assume that you tested/subbed all the tubes in those sections. There are several 10 meg or so resistors in the focus circuit that could increase in value so you will want to check those. Have you measured the high voltage and focus voltage? If you do not have a high voltage probe they are usually available on eBay,
Steve
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