Matched Pair Tung-Sol Wizard National Union NU 6K6 6K6G Vacuum Tubes Black And Silver Bottles ST Shoulder Style NOS-Testing Vintage Parts for shorts

for shorts

Tube Two measured 1490/23

Transconductance: 2219 / 2211 (M-M has no recommended value

This National Union plate 813 output triode was tested on our Paul Hart-calibrated for shorts

This Cunningham narrow bottle 25Z5 tube was tested on our Paul Hart-calibrated TV7/U for emissions

Matched Pair Tung-Sol Wizard National Union NU 6K6 6K6G Vacuum Tubes Black And Silver Bottles ST Shoulder Style NOS-Testing Vintage Parts for shortsThis new old stock testing matched pair of National Union MANUFACTURED, Wizard BRANDED 6K6G tubes was tested on our Maxi Matcher with real world voltages of 325 volts on the plates and a bias of 36 volts. Tube One drew 26 milliamps' plate current while Tube Two drew 28. 6. Transconductance measured 1800 and 2100 micromhos, respectively, where new nominal is within one standard deviation of 1900. These are beautiful tubes with black and silver Coke