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Useless Tube Testers collection.
People think these tubes testers say how "good" the tubes are. So the futher in the green the better. Reality is, these tester tell only if the tube will "probably" work or probably not. Such testers give only probability, because in fact they don't really know what they are doing. The largest uncertainty with such test results is the tester itself, not the tubes you are testing with them. They don't get any better from "calibration". They're just useless.
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