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In Reply to: RE: Tube Tester Variation Question Again . . . posted by FenderLover on April 23, 2010 at 02:05:49
Tah Dah! As Audiophiles we would like to believe tube testers were designed & intended to be used for matching Hi-Fi Audio tubes when in fact they were primarily used to quickly discover a faulty tube in a perhaps 2-Dozen tube TV set & often during a House call. Or for maintaining an even more complex Military Radar apparatus. Further believing that all examples of todays' remaining vintage testers are or could be restored to near-identical performance regardless of Brand or model is also mythical. Your Hi-Fi rig can & will tell you more about a tube than any tester could & within such context Testers are merely Novelty toys while a Multi-meter can check for inter-element shorts.
Follow Ups:
Well put.
Too much emphasis on tester readings these days and it's just wasted time taken away from important things like.............
CW
once every 4 years.
However, tube tester readings are important when purchasing tubes on auction sites. I accept the theory of relevancy when it comes to testers and test data, but in my situation ONLY(TV-7 vs Hickok 6000), I expected closer test results based on Chris Haedt's experiment. My reading of 4875 umhos vs the sellers reading of 10000 umhos is just way too far off. If nothing else, Chris Haedt's experiment showing almost identical readings reveals that these two testers probably use similar test settings. So, it appears that either calibration or oscillation might be to blame. My TV-7 was calibrated a week ago using the military technical manual.
The two things I have learned from reading other audio sites is that I should ask sellers what their reject point is for their tester and what a NOS tube reads on their tester. That would at least give me a rough idea of tube life. Secondly, no matter what the micromho reading is on the seller's tester, I can at least tell if the 2 or 4 tubes are somewhat matched.
Worry? Certainly not about tube readings!
tube tester results?
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