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The CRT could be asleep (if not used regularly the cathode acts as a getter and develops an insulative layer of crap over its emissive surface over the course of a few months/years/decades). Leave it in emission test mode for an hour, and if it does not register anything up the heater voltage to 1.4X it's designed value, switch to emission mode and let it sit for 1-5 hours (once emission hits the good range you can stop cooking the heather).
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