Matched Pair Sylvania 6F6 6F6GT Vacuum Tubes Clear Bottles NOS-Testing 26LX6 Transconductance measured 64 for both

Transconductance measured 64 for both tubes where minimum (65%) is 40

This RCA 1L6 vacuum tube tested 19 on our Paul Hart-calibrated TV7/U where minimum (65%) is 16 and 100% is 25

respectively nominal is within a standard deviation of 1100

Tube One measured 17

The Superior-tested tube measured "low to medium-good

Matched Pair Sylvania 6F6 6F6GT Vacuum Tubes Clear Bottles NOS-Testing 26LX6 Transconductance measured 64 for bothThis new old stock TESTING matched pair of Sylvania 6F6GT tubes was tested on our Maxi Matcher with 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 27. 2 milliamps' plate current and measured 1930 micromhos while Tube Two measured 27. 7 1950 where new 6F6s measure from approximately 2000 micromhos or so with plate current draw in the 20s. These tubes have gray, three hole