Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB things have obviously improved

things have obviously improved

51/50 and 51/51

54/54 and 54/54 where minimum (65%) is 40/40 and 100% is 62/62

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

This matched pair of Westinghouse Reliatron 5U4GB rectifiers was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing CBS NOS NIB things have obviously improvedThis 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;