Matched Pair National Union NU 45 #45 Vacuum Tubes Including A 1P21 These three RCA plate number

These three RCA plate number 78 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

This matched trio of RCA 6FQ7 / 6CG7 dual triodes was tested on our TV7/U for shorts

This matched pair of Philips Miniwatt PCF80 / 9U8 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

These three GE 6BC5 tubes tested to spec on our Paul Hart-calibrated TV7/U

1 milliamps' plate current while Tube Two drew 19

Matched Pair National Union NU 45 #45 Vacuum Tubes Including A 1P21 These three RCA plate numberThis pair of National Union black plate 45 output triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 62 while Tube Two measured 69. Minimum (65%) is 47 and 100% is within a half standard deviation of 72 or so. These tubes have banded phi shaped mica spacers; GT and JY date codes; dimpled sheet getters; ribbed, charcoal plates and excellent flashing WE HAVE SCORES OF