Thanks for the responses guys.
I checked the wires from OB -> Terminal 7, and Terminal 7 -> B3, and they are show no issues.
Just reflowed the 6080 terminals, no change. I suspect it may just be the tube. Both sides are glowing, but at the top of the tube one side is glowing bright, and the other not at all. I'm going to order a new one and see if that fixes it.
As for checking the voltage on the heater pins, are there any directions you can point me to? I know the heaters are pins 7 & 8, but I don't know where to measure between, and what voltages I'm looking for.
Thanks!