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Try holding the ungrounded blade of a well insulated plastic handle screwdriver to the cap of the HV rectifier tube (1B3?) you should be able to draw a decent sized arc from it if there is HV, that at least tells you that there's HV to the cap of the tube but not for sure it's reaching the CRT.
Did you put the Ion Trap on the neck of the CRT? If your original one had the neck broken off you might be missing this part.
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