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At the suggestion of someone, I wired in a 2 meg pot to take the focus electrode, pin 6 of the CRT, from ground to 300 volts. I did and that didn't help at all. I also checked to be sure I had continuity from the CRT harness to the CRT base when the connector was plugged to the CRT. That checked good.
Maybe a broken focus wire from the base to the bulb?
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