(1) Tested Sylvania 6BJ8 Tube with Box Date Code NR KAB Canada Twin Diode Triode

(1) Tested Strong Magnavox 6BJ8 Tube Date Code 64-52 Twin Diode Triode Tube

(1) Tested Sylvania 6BJ8 Tube with Box Date Code ER DHL Twin Diode Triode

(1) Tested RCA 7K7 Tube Date Code 322 Diode Triode Loktal Tube

(1) Tested RCA 6BF6 Tube Date Code KG Twin Diode Medium Mu Triode Tube

(1) Tested Strong Ken-Rad 12AT6 Tube Date Code 6-30 Twin Diode High Mu Triode

(1) Tested RCA 6Q7GT Tube Date Code YJL Twin Diode High Mu Triode Tube

(1) Tested RCA 6AT6 Tube Date Code LQ Twin Diode High Mu Triode Tube