Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black GlassThis matched pair of Ken Rad 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 20. 4 milliamps' plate current while Tube Two drew 21. 8. Transconductance was 1670 for Tube One and 1570 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 great. WE HAVE SCORES OF THOUSANDS OF VACUUM

Tube One measured 56/58 while Tube Two measured 59/56 where minimum (65%) is 50/50 and 100% is 77/77

new in box and test 15

Height: 41 MM

These four US-made 6SF7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

I am playing them as I write in my Radio Craftsmen RC-2 monoblocks with RCA Living Stereo's CD of Bartok's "Concerto For Orchestra

new in box RCA 6LJ6A / 6LH6A tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 58 for Tube One and 59 for Tube Two where minimum (65%) is 40

This matched pair of Raytheon black plate

They measured 85/66 for Tube One and 85/70 for Tube Two where minimum (65%) is 57/57 and 100% is 88/88

new in box US-made 1S5 tubes tested to spec on our TV7

Plate current draw was 9

These two Philco 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts