Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS-Testing 6K6 a clear top with gray

a clear top with gray plates and excellent flashing

Transconductance was 1240 for Tube One and 1380 for Tube Two where new/nominal is within one standard deviation of 1900

IT IS YOUR LOSS AND YOUR RESPONSIBILITY TO FILE A REPORT WITH THE POSTAL INSPECTOR

I BUY TUBES IN BULK

60 and 60 where minimum (65%) is 40

Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS-Testing 6K6 a clear top with grayThis matched pair of new old stock testing General Electric GE 12SN7 12SN7GTA dual triodes was tested on our Jackson 648 Mutual Conductance tester for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 95% 93% and 95% 94% for Tube Two. (New 6SN7s typically test from 2600 micromhos and the Jackson expresses this as a percentage.) I am playing them as I write in my Alan Eaton single ended 45 amplifier with RCA Living