Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape NOS-Testing 50L6GT Gebraucht perforated plates

perforated plates

round mica spacers

new in box Sylvania 6BQ6 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box 6CX8 tube tested to spec on our Paul Hart-calibrated TV7/U

5 standard deviations of 3600 micromhos like their 12AT7 cousins)

Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape NOS-Testing 50L6GT Gebraucht perforated platesThis new old stock TESTING 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 drew 21. 3 milliamps' plate current and measured 2090 micromhos while Tube Two measured 23 2130 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s. These tubes have copper support rods; gray and silver