RCA 12BH7 12BH7A Vacuum Tube Valve NOS NIB Zenith Octal All measured 2100 micromhos where

All measured 2100 micromhos where new/nominal is 2000 and minimum (65%) is 1300

7 (New is approximately 17)

I am playing them as I write in my Alan Eaton single-ended triode amplifier with Talking Heads' "Fear Of Music" and they sound outstanding

This Raytheon (JAPAN) 12SN7GTA dual triode was tested on our Paul Hart-calibrated TV7 for shorts

4 milliamps' plate current while Tube Two drew 21

RCA 12BH7 12BH7A Vacuum Tube Valve NOS NIB Zenith Octal All measured 2100 micromhos whereThis new old stock testing RCA 12BH7A was tested on our Maxi Preamp II for shorts, gas, noise, transconductance and gain. There were no shorts, noise or gas and it tests as follows: Noise: 84. 3 dB 83. 6 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 2219 2211 (M M has no recommended value. New 12BH7s have averaged 2200 to date) Gain (Mu ()): 17. 1 16. 5 (New nominal is with a standard deviation of 16 16) As I write, I am playing it