Slater wrote:

Jamie t wrote:


That looks like HV leaking somewhere. You may also have some
cracked insulation in the Anode lead or flyback coil. You could
even have a cracked solder joint or moisture in it.


Thank you very much for your advice. It's not doing that anymore. It
looks like some oxide or dirt is present in the vertical size
regulation knob, although I'm not 100% sure.
That's another possibility.

Jamie