After studying the schematic and re-testing the tubes in the vertical
section, I looked again at the sync/sweep circuit board and spotted a
cracked resistor (circled). The crack is in the silver band and split the
resistor in half, resulting in a loss of voltage to part of the vertical sweep
section. I soldered in a replacement of the same resistance but of higher wattage
so heat stress on the part would be reduced.
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