Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass January 30 2026 This lot of nine new

This lot of nine new old stock

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

new in box RCA 53HK7 tubes

These five Ken-Rad number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

new in box RCA 6DW4B tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Ken-Rad 6K6 6K6GT Vacuum Tubes Black Glass January 30 2026 This lot of nine newThis 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