Matched Pair Canadian General Electric GE 12SN7 12SN7GT Vacuum Tubes Valves Black Plate NOS NIB 7476 7676 7676 Transconductance measured 2850 micromhos for

Transconductance measured 2850 micromhos for Tube One with a current draw of 21

It is a faithful transfer of the 78 sources and

These five RCA 5763 tubes tested as follows on our Paul Hart-calibrated TV7/U:

These four US-made 6AB4 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Realistic (Radio Shack) Gold Clad 6AK5 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Canadian General Electric GE 12SN7 12SN7GT Vacuum Tubes Valves Black Plate NOS NIB 7476 7676 7676 Transconductance measured 2850 micromhos forThis new old stock, new in box matched pair of Canadian GE black, T plate 12SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they tested as follows: Tube One: 83 84 Tube Two 85 86 These tubes have steel support rods; black T plates; rectangle top mica spacers with chevrons; D getters and short bases. I am playing them as I write in my Alan Eaton single ended triode