Motorola ts4j

[bandersen]

Keep in mind that the resistance of tube filament is temperature dependent. I really doubt that is the source of your problem.

Keep in mind what Tom posted earlier. B+ is created by the balance of several tubes. If it's off then either the tubes supplying current are not passing enough or the tubes drawing current are sinking too much. That could be caused by the tubes being bad or they are not biased correctly. Try swapping tube and check the voltages on them.