Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 new in box National Union

new in box National Union 25Z5 tubes tested to spec on our Paul Hart-calibrated TV7/U

It has copper support rods

new in box RCA 6GU7 tubes for sale in this listing

This gold pin

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

Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 new in box National UnionThis 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