(1) Tested Sylvania 6MD8 Tube with Box Date Code fd AJD Medium Mu Triple Triode

(1) Tested Sylvania 6ES5 Tube Date Code AAU High Mu Triode Tube

(1) Tested Sylvania Type 27 Tube Date Code 13R Medium Mu Triode Tube

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

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

(1) Tested Westinghouse 2AF4A Tube Date Code 61-13 Medium Mu Triode Tube (a)

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

(1) Tested Philco 6AT6 Tube Date Code 50-13 Dual Diode High Mu Triode Tube