The only way a TV tube is going to work is if you are using a motherboard with TV out. And the rest of the TV innards are intact and working.

I'm wondering if the 12" RGB might be primitive enough/good enough quality for the resolution boost?

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Well, you know, there are stories floating around (poorly documented alas) that someone used the analog board from a 575 to get both 640x480 and 800x600 on the stock CC tube. Applefritter was the last place I spotted that.