Matched Pair Sylvania 6K6 6K6GT Gray And Silver Bottles Vacuum Tubes Valves 6FQ7 Sixcgseven chamfered O getters and rectangular

chamfered O getters and rectangular radiators for cooler operation and longer tube life

These two Zenith 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

28/27 and 33/26 where minimum (65%) is 18/18

I just cleaned this LP set on my VPI 16

Matched Pair Sylvania 6K6 6K6GT Gray And Silver Bottles Vacuum Tubes Valves 6FQ7 Sixcgseven chamfered O getters and rectangularThis 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 26. 8 milliamps' plate current and measured 1600 micromhos. Tube Two measured 27. 4 1700. New nominal is within one standard deviation of 1900. These tubes have pretty gray and silver bottles; copper support rods; rectangular mica spacers