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

(1) Tested National Union 12AL5 Tube with Box Date Code 5152 Double Diode Tube

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

(1) Tested Strong RCA 12H6 Tube with Cleaver Brooks Box Date Code DE Diode (b)

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

(1) Tested RCA 12BR7 Tube with Box Date Code AV Twin Diode Triode Tube

(1) Tested Sylvania 12AV6 Tube Date Code bh AUN 12AV6 Twin Diode High Mu Triode

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