Testing 12AX7's

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Testing 12AX7's

Post by Wildcat445 on Sun Jun 08, 2014 9:01 am

I ran across four 12AX7's the other day that tested weirdly on my Jackson 628S tester. One section of these four tubes would peg the meter on my tester. I tested a few tubes from my stash, and they did not do this. Is there something I should know and am missing? I replaced the tubes, but am not going to toss them until I figure out what is going on. I don't think it is a tester setting issue, since different sections did this. I have not run across this before. For what it is worth, these four tubes are out of the same set.



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