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So. Bump I guess. I have the exact same symptom as that photograph. I.e. virtually no vertical deflection. Mine is a 1077B and the horizontal oscillator is fed by a couple of J/K flip flop ICs. I have found one circuit diagram with that arrangement, but my circuit is different in that it has a 8FQ7 rather than a 6FQ7. I can’t find a voltage chart that I can be sure matches my circuit so testing the voltages of that tube seems a little pointless.
I have a CD coming that supposedly has the 1077B manuals on it - we’ll see. In the meantime I wonder if you got to the root of this problem (lack of vertical deflection).
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