Matched Pair Sylvania 6K6 6K6GT Gray And Silver Bottles Vacuum Tubes Valves 6FQ7 Sixcgseven I just cleaned this LP

I just cleaned this LP set on my VPI 16

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

46 and 50 where minimum (65%) is 30 and 100% is 47

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

Tubes Three and Four measured 1100 and 1150

Matched Pair Sylvania 6K6 6K6GT Gray And Silver Bottles Vacuum Tubes Valves 6FQ7 Sixcgseven I just cleaned this LPThis 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