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In Reply to: RE: JAN GE 5670 black burn marks on getter flashing posted by kylealers@gmail.com on July 09, 2015 at 14:03:02
Many tubes develop the black (or gray) marks above the cathodes and they are of no consequence. Most likely these occur due to impurities in the glass or within the tube itself.
Follow Ups:
These are the burn marks on the getter flashing
So these burn marks are normal and nothing to worry about?
These tubes often come with that sort of coloring right out of the box, brand new. It's nothing to worry about.
When I got them they had the silver black burn coating on the inside glass but there are black burn marks on the silver black coating now after using them for a bit
Keep in mind that those are not signs of burning. Really, your tubes look just fine to me, and some here say I know what I'm talking about!
Do remember that if the tubes sit for a long time there may be some outgassing of the internal parts, and the getter is there to absorb that. Once that task is done the rate of getter useage drops off.
Don't worry about them, just enjoy them. They are fine.
Thanx you so much I feel really relieved now I waited al long time fot them to arrive wouldn't want them burning up or something
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