Finally, all caps have been restuff and a couple dozen resistors replaced.
I then adjusted the HV supply to get 5kV. That improved the brightness at the expense of the image shrinking. The deflection plates need to be driven harder as the HV increases.
Swapping the 12SN7s around helped somewhat but the height control is maxed out. This is definitely a case where tube can test great but not work very well in a set. I'll dig around for some more tubes to try.
The contrast had improved as a result of replacing all those bad resistors in the IF.
The horizontal linearity needs some help too. There is a trimmer cap under the chassis that has a major impact on the width and linearity. I'll have to adjust it with a test pattern generator.
I think the funky interference pattern is due to the HV box top not being fully secured.
