This listing is for a good used vintage Sylvania type 12SN7GT twin triode vacuum tube.
This tube tested great on a reliable Hickok Model 800A tube tester (a dynamic mutual conductance tester). ... and NO shorts or gas detected.
Here are the readings for the triode sections: 2850/3000. Both sections tested above new tube specs, and closely matched!
Ref: Minimum readings should be 1560/1560 micromhos and new tubes should test at 2600/2600 or more micromhos.
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