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Interpreting Eico 635 test range


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This tester has 50 as the start of the "good" range, and 100 max.

I tubes are testing at 55/57, as a result of the two tests for tubes like 6922 & 12AX7, does that mean the tube is pretty much on its last leg. How much longer should I expect 12ax7's in this range to last in something like Quicksilver Mini-Mites?

DC

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