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Yes, for sure measure the heater voltage output of the tester with a decent voltmeter, known to be in reasonable calibration. Measure the socket with no load and also when connected to the crt. Indeed, the tester switch could be mis-registered or even mis-wired.
I would NEVER connect an un-verified tester to a nearly unobtainable CRT or even a small inexpensive vacuum tube... NEVER!
jr
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