(1) Tested RCA 6AT6 Tube Date Code LQ Twin Diode High Mu Triode Tube

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

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

(1) Tested RCA 12BR7 Tube with Box Date Code AV Twin Diode Triode Tube

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

(1) Tested Raytheon 12EL6 Tube with Box Dual Diode High Mu Triode Tube (b)

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

(1) Tested Raytheon 12EL6 Tube with Box Code IO4 Dual Diode High Mu Triode (a)