Yep, it's Eric H's Capehart from here:
http://www.audiokarma.org/forums/sho...ght=Farnsworth
Thanks again Eric for setting me up.
I didn't want to plug in the Beltron CRT Restorer at least until I pop the hood and once-over the capacitors and such. I'll do that today later. Thanksgiving break, I have some spare time for a change.
The problem occurred immediately. In fact first thing I did was forget to put the ion trap on, and with the dark screen it would "snap" and the screen would slightly light up. Soon as I figured out the ion trap was laying on top of the cabinet, I put it on and got the above results. It happens moments after powering on the set (about the usual time for tubes to warm up) and does it repeatedly until I lose my nerve and unplug the set.
I hope adjusting the HV will settle it down, otherwise I hope it's just the CRT (I have a couple of untested parts-set 10BP4's too, but want to test them first once the Beltron is up and running). Will post more later.