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Gassy tube is likely, but before you close the book on it, do you know that the tester is working properly? Do you have a different known good picture tube you can test to verify the tester?
If you know the tester is good hooking the tube to a high power 6V heater transformer and observing opperation is another way to confirm gas. The Sencore manual may also have a section on gassy tubes...My B&K 466 gives pretty clear indication of gas on its cutoff test....It will even light up the gas!
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