10fp4 purple glow

[Eric H]

How does it test? Is it on the inside surface of the glass or between the elements?
I've seen a surface glow too on some CRT's. I don't think it hurts anything as long as it's just on the glass.

If the tube is leaking it's most likely through the base, which would get replaced during the rebuild process.

[tvdude1]

Only glows when you push test button and its in the center of the gun only. It glows the size of a match head.

[tvdude1]

Also no emissions at all.

[jr_tech]

Originally Posted by tvdude1

Also no emissions at all.

Hot Shot it? It sounds like you would have nothing to loose by running the heater for a few hours at 8 volts (or so) then re-testing.

jr

[tvdude1]

Will try it.

[jeyurkon]

It does sound gassy. I have a test CRT that does that but it still works. I don't think the test CRT has a leak. There's a burned spot in the center where it was powered up without sweep and I think the gas came from that.

I agree that you have nothing to lose by running it at 8 volts for awhile. If it does recover you might not have the best focus.

John

[Eric H]

Sounds like it's gassy.
Can you put it in a set and apply the high voltage? If it's badly gassy the whole neck should glow purple.