Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 They tested 50/38

They tested 50/38

47 and 48 where minimum (65%) is 30 and 100% is 72

This perfectly-matched quintet of new old stock-testing Sylvania-MANUFACTURED 7A7 tubes was tested on our Hickok 800 for shorts

This gold pin

Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 They tested 50/38This perfectly matched pair of milspec GE 6C4 6C4WA triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Both tubes measured 72 where minimum (65%) is 55 and 100% 85. They have gray plates; top O getters and two additional support rods for increased ruggedness and microphony suppression. These tubes have acid etched codes and designations as well as silk screened 68 26 188 5 67 50