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In Reply to: RE: Excellent answer posted by mondial on January 30, 2016 at 17:41:53:
AT1000 Standard tube warm up time counts down from 60 seconds. You'll get fairly consistent readings with a three minute warm up. Note both these tubes are dual section triodes, two section tubes in one device, so the AT will prompt you for the second set of measurements on the readout when you're done with testing the first section. You test/ match both sections for Mu and gm regardless of what tester you are using.Check out this site for tube matching and testing triodes as this really is very basic and helpful. Mu or gain is what the AT incorrectly calls emissions.
http://www.tubeaudiostore.com/tubmatdem.html
Despite all the technical stuff, you care about two readings, Mu & gm. If the separate readings for both sections of tubes and with other tubes match to within 10 % or so and the percentage of both readings is not much less than 80% of specification, you will be fine.
Alternatively rerun the tests with proper warmup time for both tubes sections for all your tubes in fixed bias mode post them and let the group tell you if they're ok.
Edits: 01/31/16 01/31/16
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Follow Ups
- Try this - Barry 09:11:19 01/31/16 (3)
- RE: Try this - mondial 15:05:31 01/31/16 (2)