One (1) 6DN7 Marconi by GE vintage vacuum tube, made in Canada,

tube has grey and black ribbed plates, clear top, side rectangular getters, tube tests: 96, 90 %

We test all tubes we sell! We will combine shipping! Check out my other tubes!

Tubes are tested for emission, as well as for shorts, life test and grid  leakage on calibrated Sencore Mighty Mite tube  tester,

on scale 1-120, good quality on my Sencore starts at 70.