Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 rectangle top mica spacers with

rectangle top mica spacers with chevrons

very-light-gray bottles and mk AAB and kg BCL date codes

Transconductance measured 35 for Tube One and 36 for Tube Two where minimum (65%) is 25 and 100% is 38

This pressing has lightly-moderate surface noise

see close-up

Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 rectangle top mica spacers withThis matched pair of RCA 6F6G tubes was tested on our Maxi Matcher 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One (RCA Victor labeled) drew 21. 2 milliamps' plate current and measured 1880 micromhos while Tube Two (Cunningham labeled) measured 21. 6 1980 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s. These tubes have copper support