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

(1) Tested RCA 6AN4 Tube Date Code KJ RCA High Mu Triode Tube

(1) Tested RCA 6EB8 Tube Date Code AP High Mu Triode Pentode Tube

(1) Tested Very Strong RCA 6GN8 Tube with Box Date Code DL High Mu Triode Tube

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

(1) Tested Philco 6J6 Tube Date Code 50-16 Medium Mu Twin Triode 6J6 S Tube

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

(1) Tested Westinghouse 6EB8 Tube Date Code 69-22 High Mu Triode Pentode Tube