Matched Pair National Union NU Number / Type 76 #76 Vacuum Tubes Odd Tubes

Matched Pair National Union NU Number / Type 76 #76 Vacuum Tubes Odd TubesThis 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

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

Plate current measured 67

gray bottles and bottom

This is a wonderfully-cheesy LP

meaning you need to indicate the quantity you want

52 and 59 respectively

This Sylvania number 76 tube tested to spec on our Paul Hart-calibrated TV7/U

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

Fortunately the wire is still there and replacing the pin should not be too difficult

Tube One measured 1380 micromhos and drew 10

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

new in box 956 tubes tested to spec on our Paul Hart-calibrated TV7/U