Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass 4th Quarter BW52 These nine National Union number

These nine National Union number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

but should be fine in non-critical applications

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

Delco-BRANDED 6SK7 tested as good on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Valves Black Glass 4th Quarter BW52 These nine National Union numberThis 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