One (1) 6550  Tung-Sol vintage vacuum tube, made in USA, original vintage,

tube has black smooth plates, triple mica, triple D getter (two on the side, one on top) 

tube tests: 96, 96 %

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.