Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing Choral Stereo LP Tung-Sol-MANUFACTURED) measured 30 while Tube

Tung-Sol-MANUFACTURED) measured 30 while Tube Two measured 31 where minimum (65%) is 22 and 100% is 34

It teats below spec but should work fine in many applications

They sound spacious with excellent dynamic range and frequency response on these challenging pieces -- and are dead quiet when the CD player is muted

They measured 28/30

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing Choral Stereo LP Tung-Sol-MANUFACTURED) measured 30 while TubeThis new old stock testing matched pair of Ken Rad MANUFACTURED, OEM BRANDED black glass 6K6GT tubes was tested on our Maxi Matcher tube tester with 325 volts on the plates and a bias of 36 volts. Tube One drew 33 milliamps' plate current while Tube Two drew 34. Transconductance was 1710 for Tube One and 1960 for Tube Two where new nominal is within one standard deviation of 1900. As I write, I am playing them in my Mini Mite 2013 and they sound