Matched Pair National Union NU Number / Type 76 #76 Vacuum Tubes Odd Tubes new in box Sylvania 6SH7

new in box Sylvania 6SH7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 1380 micromhos and drew 10

They measured 31 and 32 where minimum (65%) is 28 and 100% is 43

gray bottles and bottom

Transconductance measured an almost-perfectly-balanced 82/84 where minimum (65%) is 56/56 and 100% is 86/86

Matched Pair National Union NU Number / Type 76 #76 Vacuum Tubes Odd Tubes new in box Sylvania 6SH7This matched pair of National Union type 76 triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 49 for Tube One and 52 for Tube Two where minimum (65%) is 36 and 100% is 55. These tubes have shiny, dark gray, rounded plates; crenelated, top, rectangular mica and smooth rectangular bottom spacers and excellent flashing. I have played them in my Radio Craftsmen