It depends on which tube tester is being used. Eico, Hickock, B&K, SICO all have different values. Also, good testers test for more than just tube strength. It gets quite confusing. That's why I would suggest buying from a reputable dealer if you are have trouble with different readings. Try www.tubesandmore.com, thetubestore.com, or upscaleaudio.com. They usually only sell new tubes and if selling used, will teach you about individual readings.
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