Matched Pair General Electric GE 12BH7 Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing 0D3 Milspec new in box PhilipsECG 6J10

new in box PhilipsECG 6J10 / 6Z10 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

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

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

came from an excellent lot and should work fine

Matched Pair General Electric GE 12BH7 Vacuum Tubes 12AU7 Substitute For Tube Rolling NOS-Testing 0D3 Milspec new in box PhilipsECG 6J10This 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