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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: What do these numbers mean? posted by Wernehawen on October 21, 2021 at 22:34:38:
Numbers like that are almost meaningless for purposes of determining whether the tubes are good or how much life remains. Relative to a tube's specified performance, minimum values vary a great deal from one tester to another and from one tube type to another. My Hickok routinely measures some types 50% or 75% above minimum, while others barely pass, even when new. In the real world, this is complicated further by that fact that most testers were manufactured decades ago and have never been calibrated or refurbished.
In evaluating small signal tubes, I look at things like actual transconductance numbers, how quickly the tubes warm up to full readings and also consistency from one to the next. And all this applies only to new tubes. Used tubes are an entirely different matter, because certain types of failures and performance issues won't show up on any tester. Then there are the power tubes, which most testers can't evaluate in any meaningful way, other than to say whether they're open or shorted.
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Follow Ups
- RE: What do these numbers mean? - Triode_Kingdom 08:48:27 10/22/21 (0)
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