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

(1) Tested GE 6J6 Tube Date Code 56-22 General Electric Medium Mu Twin Triode

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

(1) Tested Westinghouse 12AV6 Tube Code 61-53 12AV6 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 Philco 6AT6 Tube Date Code 50-13 Dual Diode High Mu Triode Tube

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