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OK, I've put as much effort into this set as I'm going to for now.
I disconnected the filament transformer and used 6VDC from batteries.
Replaced the filter choke with a power resistor.
Added an extra 100uF cap to both B+ and B++ supplies.
All that did reduce the 60Hz distortion from both the vertical and horizontal but did not completely eliminate it.
I'm going to patch it all back together and call it done until some new insight comes up.
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