(1) Tested Sylvania 12BR7 Tube with Box Date Code bf JEK Twin Diode Triode Tube

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

(1) Tested RCA 6BJ8 Tube Date Code AC RCA Twin Diode Triode Tube

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

(1) Tested RCA 12BF6 Tube with Box Date Code KH Double Diode Triode Vacuum Tube

(1) Tested RCA 6AT6 Tube with Box Date Code BF Twin Diode High Mu Triode Tube

(1) Tested Strong RCA 8GN8 Tube with Box Date Code AV Triode Pentode Tube

(1) Tested RCA 5X8 Tube with Box Date Code KP Triode Pentode Tube