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Those early 23V/25V inline tri-focus CRT's didn't hold up nearly as well as the older delta gun CRT's. I agree that your tube is weak; but, you should be able to get a somewhat acceptable picture on it. Of course, it will only get worse over time. I've seen these that were so weak that no gun would reach cutoff and they'd all 3 read in the very low end of the "BAD" scale. As you can imagine, the picture wasn't too good on those really weak ones.
And, I think the reading on that B+ fuse is normal. I think those are of the slo-blo type and they will show some resistance.
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