Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing 6J1 Pentodes 4 Sale new in box GE 5AM8

new in box GE 5AM8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Setchell-Carlson-BOXED 6GV8 / ECL85 tube tested to spec on our Paul Hart-calibrated TV7/U

They have gray plates

This amp was designed to use 6SN7s and I do not recommend using 12SN7s

new in box GE 19CG3 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing 6J1 Pentodes 4 Sale new in box GE 5AM8This new old stock TESTING matched pair of Tung Sol 6K6GT tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 26 milliamps' plate current and measured 2030 micromhos. Tube Two measured 26. 1 2000. New nominal is within one standard deviation of 1900. These tubes have pretty black bottles that entirely cover the top half of the tubes; copper