Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing Ken-Rad 35Z6 NOS NIB excised chevrons in their top

excised chevrons in their top mica spacers as well as 210 5439 and 5413 provenance/date codes

I have played it in my Alan Eaton singe-ended 45 amplifier (at 6

The surface noise in the lead-in is moderate and as things progress it diminishes and things quiet down nicely

Tube One has some oxide flaking

Matched Pair Tung-Sol 6K6 6K6GT Black Bottles Vacuum Tubes NOS-Testing Ken-Rad 35Z6 NOS NIB excised chevrons in their topThis 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. 3 milliamps' plate current and measured 2060 micromhos. Tube Two measured 25. 4 2080. New nominal is within one standard deviation of 1900. These tubes have pretty black bottles that entirely cover the top half of the tubes;