I know, you was thinking why in the world would you want your tube brighter??? So yeah, I'm really talking about a TV picture tube brightener. I bought a GE Tube Caddy years ago that had various vintage tubes and parts in it that became my tube stash container, pictured below.
There were two parts in there that I didn't know what was but I kept them. Today I was going through the caddy and seen them and decided to do a search on them. Turns out if I'm interpreting it correctly, it's an attachment you hook on to the pin connectors of your picture tube when it was getting old and dim to brighten it up.
Then I begin to remember that the picture tube was the most expensive part on the TV and would pretty much warrant buying a new TV rather than replacing it. Now I remember that when you call a TV repairman they would do, I think? something called shooting the tube where they did something to reinvigorate the picture tube that sometimes would make the picture clearer and last a little longer. I don't remember the brightener circuit connector that you attached to the back of the picture tube pins, but here in my catty there are two of them. Yes when the picture tube would start to go out, you would go to extra measures to get a little more life out of it, because a new TV was a major investment back then. Now we just Chunk-um
If I got it all wrong, maybe someone can straighten me out