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Check the ion trap (try adjusting for max brightness in dark or nearly dark room), and compare the gun bias voltages to the schematic....May also want to evaluate how the controls effect those voltage versus what the schematic voltages and resistances indicate those controls should be capable of.
If you have a WELL INSULATED plastic handle screw driver then you may want to see how long of an arc you can draw with it off of the HV.
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