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A continuity check at the heater pins of the unplugged tube should tell you a good bit about it's health, now that I think about it.
It is easy for a set with a good fly not to produce HV.....It could be caused by a large number of things such as the H osc. not working to spec., the H output tube being weak or miss-biased(any element too far off could kill HV and or cause redplating), horizontal stage fuse being blown, yoke bad or unplugged, HV rect tube bad, or it's heater winding shorted to ground, bad damper tube, etc., etc, etc.....
Don't give up. Get a schematic for it if you don't have one, and check measurable listed voltages in the horizontal section of that schematic and look for discrepancies.
You should put a tube tester on your list of equipment to get. They won't find all problems in horizontal stage tubes, but they will keep you from putting tubes in your set that are DEFINITELY not going to work, and you can never be sure a NOS tube is good without testing it.
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