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I've come up with a solution to the "use" vs "display" question I've been wrestling with. 7EP4s do not grow on trees, and if I should happen to find a good one, I won't want to use it too much. There is a pin for pin compatible tube that would work in the set with no modifications: the 5BP4. The only real differences between them are screen size, 5 vs 7 inch diameter, and max ultor voltage (which I'll ignore; running a 5BP4 at 2500 isn't going to bring about the end of days).
If the set works well enough to warrant daily driver status, I'll cut and finish two new front boards, one with an opening sized for a 5BP4, the second for the 7EP4. On special occasions I'll swap in the 7 inch board and CRT, the rest of the time I'll just use the 5 inch board with a 5BP4. I can have my cake and eat it too...
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