Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape T33 for Backup round mica spacers and anode

round mica spacers and anode radiators for cooler tube operation and longer life

They measured (from left to right) 46

Tube One measured 65/66 while Tube Two measured 69/64 where minimum (65%) is 56/56 and 100% is 87/87

outstanding flashing and a P1 date code

TV7/U readings are in (parenthesis)

Matched Pair RCA 6F6 6F6G Vacuum Tubes ST Shoulder Shape T33 for Backup round mica spacers and anodeThis matched pair of RCA MANUFACTURED 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 (Emerson LABELED, RCA MANUFACTURED) drew 16. 6 milliamps' plate current and measured 1800 micromhos while Tube Two measured 17. 6 1780 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s. These tubes have 274 649