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

(1) Tested Philco 8FQ7 Tube Date Code N-41 Japan Medium Mu Twin Triode Tube

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

(1) Tested Balanced RCA 6N7 Tube Date Code 922 Medium Mu Twin Power Triode Tube

(1) Tested Truetone 6BK7A Tube with Box Code 5743 6BK7 A Twin Triode Tube

(1) Tested Sylvania 6FQ7 Tube Date Code 636 Sylvania Medium Mu Twin Triode Tube

(1) Tested Raytheon 6S4A Tube with Box Japan Code M14 Medium Mu Triode Tube

(1) Tested RCA 7060 Tube with Box Date Code 5-35 Medium Mu Triode Pentode Tube