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That's good. I would check other tubes of known working and non-working status to make sure the tester is telling you the truth. I've bought sets at the ETF where someone tested the tube good and it was very bad and tubes where they tested the tube bad and it was good.
It probably is good, but testers can lie to you so get a feel of it on multiple tubes of known performance to be completely sure, and get a better feel for your new tester.
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