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

There were no shorts or gas and they measured as follows (from left to right

Tube One measured 17

Transconductance was 1670 for Tube One and 1570 for Tube Two where new/nominal is within one standard deviation of 1900

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