[old_tv_nut]

Ok, I downloaded the schematic now.
I see the H drive is a variable capacitor. It would be interesting to know if the best setting is max or min.
Also: what components in the Hor. Osc and Hor. output stages have you measured or replaced?
Unfortunately the schematic I found has no voltages or waveforms - they would be helpful.

Have you adjusted the horizontal lock to get things synced with the horizontal hold centered?

I see that different valus of C419 are specified for different chassis. This seems to indicate that C419 and the attached capacitor C420 are critical.