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

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

This lot of four Tung-Sol coated glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

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

electricity and chemicals and a 623 date code

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

round mica spacers

new in box US-made 12SF5/ 12SF5GT tubes tested to spec on our Paul Hart-calibrated TV7/U

56 and 58 where minimum (65%) is 40 and 100% is 62

It measured 29 and 63/37 where minimum (65%) is 24 40/40 and 100% is 36 and 62/62

They appear unused and come with boxes

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

000 VACUUM TUBES

perforated plates