Flyback temperature

[old_coot88]

Originally Posted by Tubejunke

Thanks and I am inclined to think the same as (correct me if wrong) if the set is holding for let's say 30min. at 200 or 210mA and then I once again see a rise, it's not going to be the coil causing the rise and adjustment would not rectify the problem. I hope my thinking is right on this.

I would agree with that approach.
In addition, i would consider putting a #44 bulb in series with the plate of the H out tube. It's rated at 250 ma at full brilliance, so it'll run a little dimmer and oranger at 200 ma. Thus any brightening will give a visual alert of current rise.
Either that or keep a milliameter in the cathode leg.