Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB new in box Tung-Sol 6136

new in box Tung-Sol 6136 tubes

things have obviously improved

but followed the original score and was recorded in the latter 1950s

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

This Sylvania 3E6 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB new in box Tung-Sol 6136This 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 25. 6 milliamps' plate current and measured 2000 micromhos. Tube Two measured 25. 8 2040. New nominal is within one standard deviation of 1900. These tubes have pretty black bottles that entirely cover the top half of the tubes;