Matched Pair RCA 1626 USA VT-137 Vacuum Tubes Milspec Micanol Bases Felicja Blumental 54/52 where minimum (65%) is

54/52 where minimum (65%) is 40/40 and 100% is 62/62

a goal-post getter

Tube Ten: 44/1800

it has no gross issues such as hum or microphonics and will work excellently in your audio device that calls for a 12AT7

Tubes Three and Four measured 73/70 and 75/72

Matched Pair RCA 1626 USA VT-137 Vacuum Tubes Milspec Micanol Bases Felicja Blumental 54/52 where minimum (65%) isThis matched pair of milspec RCA VT 137 1626 triodes was tested on our Paul Hart calibrated TV7 U tester tube tester for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 69 while Tube Two measured 70 where minimum (65%) is 53 and 100% is 82. These tubes have micanol bases; large D getters and four steel snubbers for increased stability and lowered microphonics. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT