Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 US-made 7C7 tubes in this

US-made 7C7 tubes in this lot

new in box Sylvania 7A6 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One drew 24

rectangle top mica spacers with chevrons

but They are more cosmetic than anything else

Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 US-made 7C7 tubes in thisThis 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