Matched Pair RCA 6AK5 Vacuum Tubes Steel Plates 116Oct28-31 56 and 57 where minimum

56 and 57 where minimum (65%) is 40

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

new in box National Union 7Y4 tubes in this lot

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

There are four new old stock

Matched Pair RCA 6AK5 Vacuum Tubes Steel Plates 116Oct28-31 56 and 57 where minimumThis 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