Predicta pedestal vertical hold

[judge]

I'll keep this thread the main one. So two more tubes arrived, 10DE7 and 9BR7. Swapped them both in and it was just a mess. Swapped them back out and it was still just a mess. One thread I saw mentioned the tubes in the IF section, so I jiggled those around a bit and the contrast suddenly improved dramatically when I jiggled the middle 3BZ6. After which I was able to get the picture stable too.

Then I noticed a burning smell and pin #5 of the 10DE7 socket was making sparks and burning the PCB. This socket has been giving me issues so I suspect I need to disconnect the PCB again and see what's going on with it. Not sure what would make that pin generate sparks like that, since it is just one of the heater pins, but this socket has been suspect for a while. Where can I get replacements, if I need one (and it isn't just dry joints)?