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Good suggestion Dave, the 7 among other chassis used the audio output as part of the LV power supply. It effectively 'split' the voltage from B+, giving around 135vdc from it's cathode to power the sync circuits. Also check any caps and resistors for drifting in the line coming from the cathode of the audio out tube, they will affect sync. If that's not it, I suppose it could be some issue with boosted B+ since vert is powered from that.
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Evolution...
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