[Tgace459]

Dirty pins?

Did you wait for the tube to warm up before measuring the voltage?

If the voltage stays 430V (429V, no different) WITH the tube in, then either the tube is bad, or the socket is dirty, or the Cathode is not grounded.
Judging by it working briefly, my bet is on the dirty socket. Or loose pin.

Yessir. I let it warm up and went back and retested it after the resurrection/death and get the same readings. I gave everything a good cleaning but Ill go back at it again and look at the pins. Is a loose pin as simple as a gentle squeeze of the socket with a needlenose?