Matched Pair Sylvania 6V6 6V6GT Vacuum Tubes Silver And Gray NOS-Testing National NOS NIB 48 and 57 were minimum

48 and 57 were minimum (65%) is 36 and 100% is 55

not included) in my AC-heated Alan Eaton single-ended 45 amplifier and they sound OK

Transconductance measured 40

Tube One measured 1630 micromhos

67 and 72 where minimum (65%) is 49

Matched Pair Sylvania 6V6 6V6GT Vacuum Tubes Silver And Gray NOS-Testing National NOS NIB 48 and 57 were minimumThis matched pair of Sylvania silver and gray 6V6GT output tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 30. 6 milliamps with a transconductance of 3060 micromhos while Tube Two measured 31. 3 2640, (New US made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so.) These