Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 This perfectly-matched quintet of new

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

These tubes have gray plates and nice flashing

It has copper support rods

They tested 50/38

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

Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB December 22 2023 This perfectly-matched quintet of newThis 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