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In Reply to: RE: You really need a tube tester that has been calibrated, or is known to be on the money... posted by Chris Garrett on May 25, 2010 at 11:22:46
You can test them only after you buy them....
I was trying to sell some tubes and the guy asked me if he could return them if they didn't test to his liking. Of course the answer was NO.
Music Is The Bridge Between Heaven & Earth
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I wouldn't buy from you either, in that circumstance. You have no way of knowing if your tubes are near death, or strong.
Many testers will give you a pass at 60% or 65%, my Triplett 3423 lists at 65% and I would tell this to the buyer, giving the transconductance number in my description and a percentage of life left.
This still doesn't paint the whole picture, because some tubes can be microphonic, more than others and even though a tube tests in the acceptable range, it still may have a triode that spits, or makes noise, so putting one in a circuit and mentioning that it's 'clean' is also a good practice.
I tested a pair of RCA (GE?) 5814As the other day, I think they were. All four triode were testing above 80%, with one tube being closer to 95%, but one tube 'buzzed' in my preamp.
Chris
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Music Is The Bridge Between Heaven & Earth
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