We are back in business!
I did some more adjustments by eye and it's better but it's time to go through it methodically from start to finish.
However, I think I should replace the original 3A3 HV rectifier and HO tube before that. I say that because I'm having trouble filling the width and the image blooms/loses focus if I don't set the brightness and contrast just right.
Even so, it is watchable.
