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For me the dot in the center would be a green light to move forward.
You know the CRT hasn't went to air, which is a huge bonus.
I didn't have a CRT tester till 2007 / 08 when a VK member gave me his old B&K.
Over all the sets I've worked on I haven't ran into many that had a bad CRT.
You could do the bare minimum, replace the electolytics in the power supply.
Replace wax/papers in the horizontal / hv circuit and get an idea even if the vertical isn't working and all you have is a flat line.
Myself, I would continue without hesitation.
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