[zenithfan1]

Originally Posted by miniman82

What is HV set at? If the regulator is glowing, there may be something awry with the grid bias circuit causing it to draw too much current. You can check by putting a current meter set to 0-1ma in the cathode circuit; with brightness at minimum you should have .8-1ma on the meter, and HV should be whatever the manual says. Usually around 23kv. If the regulator circuit checks out, roll 6BK4's you might have a bad one. There are more rugged versions on the streets, I have a 6BK4C from Tandy that looks like it has way heavier plate structure. But since I run most of my regs at minimum all the time, I never have this problem.

Thanks for the tips Nick. I have the HV set at 24Kv like the manual says. I wanted to check the regulator current the other night when I set the HOT current but the 9V in my meter died I'll look into it tonight since I've replaced the battery. I'll bet some resistors are bad in that circuit. I'll check those too and report back. The 6BK4 is the original one but I tried two others with the same result so something is up with the chassis....