Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 This pressing has lightly-moderate surface

This pressing has lightly-moderate surface noise

US-made 7C7 tubes in this lot

12AT7s are notorious for their unmatched triodes and their deviation from nominal parameters

nice flashing

Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape TV7 World War 2 This pressing has lightly-moderate surfaceThis 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