GE JG-5751 Black Plate Triple Mica Tubes 12AX7 ECC83 PairTested with Triplett tube tester: Short test, value (emissions) test, open element test, filament and tap continuity test. No upper or lower range specified. Emission tested ~85. (where bad test ~50, and a very very high test ~90-92) These are strong testing tubes. Also run tested in a Mcintosh preamp for noise and performance.
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