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Old 21st May 2021, 3:45 pm   #31
Jac
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Join Date: Jun 2006
Location: Eindhoven, Netherlands.
Posts: 565
Default Re: Help with some old TV tubes.

Adrian,

That is perfectly feasible.
You can use some liquid aquadag or for example a spray can of Graphit 33.

I had some Graphit 33, but the propellant was gone over time.
I opened the can and used it as a liquid aquadag which I applied with a brush.
Or, perhaps, for this CRT I used some aquadag that I still had - can't remember.
It is not critical at all.

It is not required to remove all the old aquadag, just remove what is not attached to the glass anymore.
If you remove everything and use a spray can, of course you get the best optical result, but the working is the same as "patching up".

A CRT with almost all aquadag gone:
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I masked the neck and around the EHT connector with tape:
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And the final result (not a very clear photo due to the black surface):
Click image for larger version

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I let it dry at room temperature, which went fast enough.
Afterwards, just give it a wipe to remove the top which always gives off a bit.

If only a small part of the layer is bad, just remove the loose parts and it is still good enough.

Hope this helps.

Jac
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