This has ribbed black plates and a wide D getter at the bottom. I tested this on my B&K 747B tube tester, and it tested at 69/71, with no shorts or grid emissions, on a scale of 0-120, with 65 minimum good.
Item Tag: 12SN7GT
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Matched Pair 12SN7 GT Black Plates D Getters RCA Nos
NOS tubes fall within the Gm characteristic range of an average tube, as published in the RCA RECEIVING TUBE MANUAL, which states “Individual tubes, like any manufactured product, may have characteristics that range above or below the values given.
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4 Sylvania 12SN7GT 3-hole bad-boy tubes TV7 & AT1000 test good used
4 Sylvania 12SN7GT 3-hole bad-boy tubes. on anAmplitrex AT1000 in fixed bias mode. AT1000 test results Good used testing and great sounding tubes. Tubes ran-in 5 min ea. before tests to ensure stability.