(1) Tested Sylvania 6N7 Tube Date Code 8-26 Medium Mu Twin Power Triode Tube

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

(1) Tested Delco 6N7 Tube Date Code 213 Medium Mu Twin Power Triode Tube

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

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

(1) Tested Sylvania 6BN4A Tube with Box Red Letters Code db ABT Medium Mu Triode

(1) Tested Philco 6AT6 Tube Date Code 50-26 Twin Diode High Mu Triode Tube

(1) Tested Sylvania 2AF4B Tube Date Code XY Medium Mu Triode Tube