Two (2) 6S4A Sylvania vintage vacuum tubes, made in USA

tubes grey ribbed plates, top O getter, 

triple mica, tubes tests: 98, 98 %

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.