Matched Pair Sylvania 6K6 6K6GT Black And Silver Bottles Vacuum Tubes NOS-Testing Products CSP 244 new in box Zenith 17CK3

new in box Zenith 17CK3 tubes tested to spec on our Paul Hart-calibrated TV7/U

It measured 56/49 where minimum (65%) is 40/40 and 100% is 62/62

They have narrow gray plates and O getters

dynamic range

but standard in this variety

Matched Pair Sylvania 6K6 6K6GT Black And Silver Bottles Vacuum Tubes NOS-Testing Products CSP 244 new in box Zenith 17CK3This matched pair of Sylvania MANUFACTURED 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 18. 8 milliamps' plate current and measured 2680 micromhos. Tube Two measured 19. 1 2820. New nominal is within one standard deviation of 1900. These tubes have pretty gray and silver bottles; copper support rods and round mica spacers. As I