(1) Tested Philco 7K7 Tube with Box Date Code P8 Diode Triode Loktal Tube

(1) Tested RCA 6BF6 Tube Date Code KG Twin Diode Medium Mu Triode Tube

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

(1) Tested RCA 8CM7 Tube with Box Date Code NI RCA Double Triode Tube

(1) Tested RCA 6BJ8 Tube Date Code AC RCA Twin Diode Triode Tube

(1) Tested Strong RCA 9AU7 Tube with Box Date Code NF RCA 9AU7 Double Triode (b)

(1) Tested Sylvania 7B4 Tube Date Code 7-52 Triode Loctal Tube Loktal Tube (a)

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