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21YP4 is a 70 degree tube, but any brightner with the same base such as a 90-degree 21CBP4/21ATP4 will work. I bet you might have one! This was the era of DIY ad-ons at least for BW TV, so these are pretty common.
I acquired a CBS 22C07 21" console from Kamakiri and its a solid set with a good CRT and all out favorite common tubes, just that its in a 10-year plan backlog before I get to it.
After losing the color war, CBS was just trying to stay in the game with a decent monochrome, so its probably worth your efforts
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"When resistors increase in value, they're worthless"
-Dave G
Last edited by DavGoodlin; 03-04-2020 at 08:16 PM.
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