Matched Pair National Union NU Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape NOS-Testing 5551 These five GE 1A7GT tubes

These five GE 1A7GT tubes tested to spec on our Paul Hart-calibrated TV-7/U

Tube Two measured 1490/23

This lot of nine RCA black plate

gray plates and excellent flashing

nicely-matched pair of Ken-Rad 6SJ7s was tested on our Paul Hart-calibrated TV7 for shorts

Matched Pair National Union NU Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape NOS-Testing 5551 These five GE 1A7GT tubesThis new old stock testing matched pair of National Union MANUFATURED Type 37 triodes was tested on our Paul Hart calibrated TV7 For shorts, gas and transconductance. There were no shorts or gas. They measured 36 and 37 (RCA LABELED, NU MANUFACTURED) where minimum (65%) is 23. They have black plates; dimpled sheet getters; old fashioned, coke bottle shape glass envelopes and terrific flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT