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Good afternoon Doug,
You are missing your negative voltages because the horizontal oscillator is not working, also, your High voltage is missing because of this!
As a quick check, please control the continuity of the 50 Ohm part of coil L22 and that you obtain about 490Kohm between 6CG7's pin 2 and ground. If these 2 tests do not point to a "smoking gun", I'll suggest you some other tests to perform to help straight out your problem.
I really doubt it is the 6CG7 itself, as it is a reliable tube, but did you try a spare tube?
Cheers
Giulio
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