Four (4) 6SN7GT RCA  vintage vacuum tubes, made in USA, 

three same date codes LB (Oct 1958), and one KJ (Apr 1957), 

tubes have black ribbed plates, clear top, 

bottom side rectangular getter, tubes tests: 

88, 86 %
86, 84 %
84, 86 %
86, 86 % 

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.