Quote:
Originally Posted by Eric H
There are some tubes that have some type of coating on the inside, like the 6V6 often has a gray coating over most of the inside surface, I don't know what the purpose of that was.
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That is what I am talking about. Like the gray coating inside this tube for example...
https://www.tablix.org/~avian/blog/a...s/img_3788.jpg
I have a lot of early tubes, and like you mentioned a few 6V6 tubes that have that same gray coloring all around the tube so you can't see inside of it easily.
By the way I know what the getter and silver coatings look like, but yes this is different.