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Misleading Ebay Tube Testing Claims

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Am I the only one who gets upset about misleading tube testing claims on ebay? I have occasionally sent messages to some ebay sellers but I'm generally ignored so I thought I'd post here and bring an example of one of these misleading auctions to everyone's attention. I've seen quite a few auctions where the seller uses an Eico 666 or 667 tester and quotes mutual conductance figures for the tubes. These testers are called "dynamic conductance" by Eico, which is nothing more than a slightly advanced version of an emissions tester. I have a 666 and it is fine for what it is, but these testers are NOT mutual conductance testers and they are incapable of determining if tubes ar truly "matched". It may be that some of these sellers are initially misled by the "dynamic conductance" label, but even after I point this out to them they continue with these claims. Also, a testing number (emissions or true mutual conductance) is useless unless you know what the value for a new tube should be or at least what the "good" range is for that tester. In the auction linked below the seller not only claims that the numbers are mutual conductance and that the tubes are matched (82, 80, 80, 80), but he also fails to mention that on the Eico tester that 80 is the lowest reading in the "good" range! That's not to say that the tubes don't have some useful life in them. I've had tubes that test in the ?? range that sound fine. But if you see claims like this using these Eico testers, beware . . .


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  Kimber Kable  


Topic - Misleading Ebay Tube Testing Claims - FlaCharlie 14:52:59 07/20/06 (7)


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