Flyback temperature

[Tubejunke]

Originally Posted by old_coot88

Aw jeez that is a bummer. Coupla questions..

Did you still get the initial 200ma reading after the eff. coil slug broke?

When the K current climbs to 250ma, what does the raster look like?

Gassy H output tube could be the cause of excessive current (since it starts out normal, then climbs).
Definitely don't run it like that, since it's hard on the fly.

OK, I am going to try to answer all questions based on this initial quote. I did get about the same readings after the slug broke. Just a chunk fell out of the back side under the chassis. The raster to me seems fine, but remember all along I have had barkhousen lines or some horizontal interference along with the distortions of the corona arching which I could never pinpoint, but sounds like it is inside of the HV rectifier. Oddly, when I did this check I had the polarity wrong on the meter, so I switched it to -DC. That was a mistake; probably a dumb one. The movement went the right way, but I did get a bit of a smell of something burning. Switched the wires, went to +DC and the arching was gone; just the runaway current....

I did save the old slug from the coil with the broken spool, but I can't get the new one to move at all and I fear it falling into a bunch of pieces and then finding out that the old slug is a different size of something. I don't know why that thing froze that fast except for possibly the coating on the windings heating up and gluing it in place. This set is driving me crazy....