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Cathodes have a carbonate coating which undergoes a conversion once high heat is applied during the cathode activation step of CRT processing, sometimes this is done while the tube is still being pumped but it doesn't have to be. RACS activated their cathodes after the tubes had been tipped off and cooled to room temp, said they never had any problem with tube poisoning. Once activated, if exposed to air the cathode must be replaced.
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Evolution...
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