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If you read 700 on emissions with the heater voltage set at 2.3Volts I would say you have a good CRT. I wouldn't put the heater voltage any highter than that. If it was a 6.3 Volt CRT you wouldn't get any emissions at 2.3 volts. You could follow up with the amp test just to confirm but if your getting 700 emissions at 2.3 volts you've probably have a very good CRT.
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