(1) Tested GE 3AV6 Tube with Box Date Code 61-17 Twin Diode High Mu Triode

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

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

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

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

(1) Tested Sylvania 6JZ8 Tube with Box Date Code hl AAO Medium Mu Triode Pentode

(1) Tested Sylvania 3GK5 Tube with Box Date Code gb AKP High Mu Triode Tube

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