From a Motorola tube caddy, new old stock, tested, new and balanced on my calibrated tv7
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TESTED ON A TV-7 TUBE TESTER. TESTED 48/50 WHERE MINIMUM GOOD VALUE IS 32/32. TEST RESULTS ARE SHOWN IN PHOTOGRAPHS.
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For sale is a RARE Matched Pair GE JG-6201/12at7/ECC81 Black Plates Triple Mica tubes D-getter. Made in USA. All tubes are also tested for noise and microphonics. Tests very strong at NEW level and tightly matched.
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GE 12AT7 ECC-81 ECC-81 NOS/NIB. FENDER PHASE INVERTER.and check back often for new inventory. You will receive this exact tube & box.
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Tube tested well on our eTracer & Hickok 800A testers. Triode #1 - Plate Current = 8.38mA \ Rp = 12014 \ Gm = 5375 \ Mu = 64.6 \ Corners = PASS. Triode #2 - Plate Current = 9.69mA \ Rp = 10769 \ Gm = 5425 \ Mu = 58.4 \ Corners = PASS.
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The tube tested on my Hickok TV-7D/U and it read 76/70. The minimum is equal to 65% of the life of the tube.
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Strong pair of GE 12AX7 long plate tubes. Horseshoe getters and identical 1958 date codes. Gm matched to about 6% difference on the Amplitrex AT1000. Number 12AX7. Small signal (i.e. 12AX7) tubes are generally checked for noise and microphonics; power tubes (i.e. 6L6) are usually not.
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