(1) Tested Sylvania 6FH5 with Box Date Code AAD Triode Vacuum tube

(1) Tested Amperex 19T8 Tube with Box Date Code 73-13 Triple Diode Triode Tube

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

(1) Tested Sylvania 6J6A Tube with Box Date Code fg AAD 6J6 A Twin Triode Tube

(1) Tested Sylvania 6T8A Tube Date Code ab ESO Triple Diode High Mu Triode Tube

(1) Tested Meck 12AT6 Tube Date Code 8-22 GE EIA Code Twin Diode High Mu Triode

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

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