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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:
I'm sure others will be more precise but here's the basics. A tube test assumes 100% is new value and 60% is "good". Below that the tube should be replaced. It may still work but will be weak. Tube sellers by and large regard 80% and over as "strong" i.e. plenty of life in the tube and should sound OK.
So "minimum value" here is assumed to be 60%. That's not great. So if that's 47, then 50 is just above 60% of new. A rather tired tube.
The actual numbers refer to transconductance (gm) and/or emission at operating conditions set out in the tube tester's manual.
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Follow Ups
- RE: What do these numbers mean? - andy evans 05:57:07 10/22/21 (2)
- I use 65% rather than 60 ~ nt ~ - Byrd69 07:36:06 10/22/21 (0)
- RE: What do these numbers mean? - Rocket_Powered 07:06:04 10/22/21 (0)
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