Matched Pair RCA 6AK5 Vacuum Tubes Steel Plates 116Oct28-31 These four US-made 12SC7 tubes

These four US-made 12SC7 tubes tested as follows on our Paul Hart-calibrated TV7/U:

dark gray rounded plates and outstanding flashing

Transconductance measured 44/45 for Tube One and 45/45 for Tube Two where minimum (65%) is 25/25 and 100% is 38

(New US-made 6V6s typically test with plate current from the mid-teens to mid-30s with transconductance from 2300 micromhos or so

Matched Pair RCA 6AK5 Vacuum Tubes Steel Plates 116Oct28-31 These four US-made 12SC7 tubesThis matched pair of RCA steel plate 6AK5 tubes was tested on our Paul Hart calibrated TV7 U tester for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 28 while Tube Two measured 29 where minimum (65%) is 22. These tubes have steel plates; top D getters and excellent flashing. I am playing them now in my Mini 2013 as I write and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE