Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB 1821A NOS NIB I am playing them in

I am playing them in one my Radio Craftsmen RC2 mono blocks as I write and they sound super even though they test poorly and have that oxide isse

This perfectly-matched pair of milspec GE 6C4 6C4WA triodes was tested on our Paul Hart-calibrated TV7/U for shorts

This LP is in very-good shape with very little noise

This album sounds good and has pops and ticks that are only discernible in quiet passages

Matched Pair General Electric GE 6C4 6C4WA Vacuum Tubes Milspec NOS NIB 1821A NOS NIB I am playing them inThis perfectly matched pair of new old stock, new in box 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 69 where minimum (65%) is 55. 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 67 05 67