Alright, sorry for the delay. Here's what I'm experiencing:
https://www.youtube.com/watch?v=tM9k...ature=youtu.be. The interference is only visible on the video when I tap the side of the set, but it's always present, it just gets worse when the set is vibrated - walking near it will do the same thing.
I did notice that the rubber cup over the CRT anode lead wasn't sitting particularly flat against the CRT. I don't think the lead is lose, but could this be HV leaking from that lead?