Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB I am writing during the

I am writing during the first few pianissimo minutes and the surface noise is distracting

new in box Tung-Sol 6136 tubes

This matched pair of milspec/industrial GE 5814A / 12AU7 / ECC82 dual triodes was tested on our Hickok 800 for shorts

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

They have 4-39 188-5 and 3-43 188-5 date codes/EIA code

Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB I am writing during theThis 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;