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Main => Monitor/Video Forum => Topic started by: CHRIS-F on June 27, 2022, 09:44:50 am

Title: Tube Coating
Post by: CHRIS-F on June 27, 2022, 09:44:50 am
Hi All,

Just wondering if the coating on the back of tubes by the Anode is important? and what is it? I scraped it a little discharging the tube, but it was already pretty scraped to begin with, does it need to be replaced and if so what do you use?

Thanks,
Chris.
Title: Re: Tube Coating
Post by: buttersoft on June 27, 2022, 07:37:49 pm
That shouldn't matter. Just make sure the area and the anode cap are clean. If you're still getting a little arcing or even corona after that, you can line the rim of the anode cap with some dielectric grease like spark plug grease.
Title: Re: Tube Coating
Post by: bobbyb13 on June 28, 2022, 01:23:54 am
Certainly looks like primer.
Does anybody know if that was sprayed on first to get the dag layer to adhere better?

I have a few that are scratched like that one and pose no problem thus far.
Title: Re: Tube Coating
Post by: buttersoft on June 28, 2022, 02:30:54 am
It's not primer, it's only ever put on around the anode button, that i've seen. And only on some tubes. I'd always presumed it was an insulating coating designed to slow down the effects of the carbon buildup from the HV, which causes arcing.
Title: Re: Tube Coating
Post by: grantspain on June 28, 2022, 02:47:41 am
its called anti corona dope
Title: Re: Tube Coating
Post by: lilshawn on June 28, 2022, 11:15:59 am
its called anti corona dope

WHO YOU CALLIN A DOPE!?

 :laugh2:
Title: Re: Tube Coating
Post by: grantspain on June 28, 2022, 03:34:09 pm
its called anti corona dope

WHO YOU CALLIN A DOPE!?

 :laugh2:
thats pretty good, unexpected  :)
Title: Re: Tube Coating
Post by: CHRIS-F on July 01, 2022, 04:29:54 am
Thanks Guys, I'll leave it if its not that important, I don't have any arcing, I just thought it may need doing to prevent any arcing.
I always thought it looked like the old red led paint