Should i bother restoring a zenith?

[Tubejunke]

Well, tonight I went ahead a got rid of one of the two "bumblebee" caps. It's the .01mfd @600. that I mentioned previously. If anyone has a schematic, it's C117 and looks to be in parallel with Red, Blue and Green G2s. Like I said, the old one measured fine, but I don't trust digital capacitance testing, so I just got rid of it with a spare .025. I hope the value change is not a problem.

I'm still wondering where the "hiss" and related picture distortion are coming from. It's in the cage for sure and it goes away periodically and the picture smooths right out. I haven't done a lot like test the tubes which is the obvious next move, but I just don't think it's tube, but Lord knows I could be wrong on that. I wish I knew what the fly should run at temperature wise. I can get a laser thermometer & check that out. I might luck out and find a sharp solder joint or something inside that cage.

OR, could this be moisture? Anybody ever heard of that? I know that moisture causes temporary problems with flybacks. Is this one of the symptoms?