Sylvania 6K6 6K6GT Vacuum Tube Black Plate Chrome Dome / Silver Top NOS-Testing US-Made 5GM6 NOS These tubes have excellent frequency

These tubes have excellent frequency response

It is dead quiet when the preamp is muted and has excellent frequency response

(New US-made 6V6s typically test with plate current from the mid-teens to mid-30s with transconductance from 2300 micromhos or so

new in box RCA 6DA4 tube tested to spec on our Paul Hart-calibrated TV7/U

Sylvania 6K6 6K6GT Vacuum Tube Black Plate Chrome Dome / Silver Top NOS-Testing US-Made 5GM6 NOS These tubes have excellent frequencyThis Sylvania 6K6GT tube was tested on our Maxi Matcher with 325 volts on the plates and a bias of 36 volts for shorts gas and transconductance. There were no shorts or gas. It measured 1680 micromhos and drew 19. 2 milliamps' plate current where new nominal is within one standard deviation of 1900. As I write, I am playing it my Mini Mite 2013 and it sounds great. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE