Matched Pair Tung-Sol 6K6 JAN-CTL-6K6GT Milspec Black Bottles Vacuum Tubes NOS-Testing 6CU6 Plate Caps Transconductance measured 50 for Tube

Transconductance measured 50 for Tube One and 54 for Tube Two where minimum (65%) is 40

Tube One: 20

I am playing them in my Bottlehead Crack headphone amplifier as I write

Four are civilian and one is milspec

It has terrific flashing

Matched Pair Tung-Sol 6K6 JAN-CTL-6K6GT Milspec Black Bottles Vacuum Tubes NOS-Testing 6CU6 Plate Caps Transconductance measured 50 for TubeThis new old stock TESTING matched pair of Tung Sol milspec JAN CTL 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 22. 7 milliamps' plate current and measured 1900 micromhos. Tube Two measured 24 1860. New nominal is within one standard deviation of 1900. These tubes have pretty black bottles that entirely cover the top half of