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I'd be interested to see what people are using in the tesla coil arena.
If you know your tester and it's gas test well the more heinous gassy CRTs will have a distinctive fail characteristic....
One nutty thing you could try is to take a monochrome chassis with 20KV or more of HV and connect the CRT leads from the chassis to one gun (with clip leads), then connect the HV. With the brightness at minimum it should produce a center dot on the screen, but if the tube is gassy there will be an arc inside the tube between the HV and the electron gun.
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