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I'd scope the B+ lines to the horizontal oscillator and driver circuits to see if there was any trash on the B+ lines. I'd also check the regulated B+ feeding the flyback and horizontal output circuit to make sure it was regulating and free of ripple or other garbage.
The newer Philips / Magnavox chassis had a 100uf, 200V cap in the 130V B+ line that would fail and cause horizontal sync problems.
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