Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass 4th Quarter BW52 They are microphonic and are

They are microphonic and are fine in the preamp stage of my MP-301 and other gentle environments

but should be fine in non-critical applications

They have engraved / hot-stamped bases on is Champion-branded and the other is Zenith

44 and 45 where minimum is (65%) is 36 and 100% is 55

This pair of GE black plate 6CG7 / 6FQ7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass 4th Quarter BW52 They are microphonic and areThis 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