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I got it working properly. It needed just the recap and a full careful alignment, as
it was badly out. Of course it didn't work well at first ... hum in the picture.
Arggggh ... it was a ground loop in my modulator setup. Looks good now,
nice sharp picture, though still retrace lines in dark low contrast
pictures.
Only one problem: the brightness control could not turn down far enough.
A zener diode in the grid lead pulled down to the -120 supply
with 1 megohm did the trick. One could of course pull the cathode
up more, but that would get it fairly close to the heater-cathode
rating of the CRT.
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