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

6/1980 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s

new in box (for Tube One) matched pair of RCA 6C8G dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

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