Matched Pair General Electric GE 12BH7 Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing 0D3 Milspec Transconductance measured 49 for Tube

Transconductance measured 49 for Tube One and 52 for Tube Two where minimum (65%) is 36 and 100% is 55

1 milliamps with a transconductance of 2640 micromhos while Tube Two measured 30

I have played it in my Schiit Audio Vali 2 headphone amplifier and it sounded great

There is no transconductance reference reading and as I test new in box 12AU7s

Matched Pair General Electric GE 12BH7 Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing 0D3 Milspec Transconductance measured 49 for TubeThis new old stock testing matched pair of GE 12BH7A dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 48 50 while Tube Two measured 49 48 where minimum (65%) is 30 30 and 100% is 46 46. These tubes have gray plates; copper support rods; excellent flashing; top harp lyre getters and anode radiators for improved cooling and longer tube life. I have played them