(1) Tested Sylvania 3AV6 Tube with Box Date Code ACG Twin Diode High Mu Triode

(1) Tested Westinghouse 12AV6 Tube Code 61-53 12AV6 Twin Diode High Mu Triode

(1) Tested Tung-Sol 12AV6 Tube Tung Sol 12AV6 Twin Diode High Mu Triode Tube

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

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

(1) Tested GE 6J6A Tube Code SW General Electric 6J6 A Medium Mu Twin Triode

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

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