Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass January 30 2026 I have played this tube

I have played this tube in my Bottlehead Crack headphone amplifier and it sounds excellent

I have played it in my Schiit Audio Vali 2 headphone amplifier and it sounded great

It has copper support rods

This lot of nine new old stock

new in box milspec RCA 6CL6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass January 30 2026 I have played this tubeThis matched pair of Ken Rad 6K6 6K6GT tubes was tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of 36 volts for shorts, gas, plate current and transconductance. There were no shorts or gas. Tube One measured 1770 micromhos, 23. 8 milliamps' plate current. Tube Two measured 1750 23. 9. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; black and silver bottles and