One (1) 5U4GB 5AS4A RCA by Sylvania vintage vacuum tube, made in USA,

tube has black smooth plates, top O getters, tube tests: 94, 92 %

Price is for all tubes pictured.

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.