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

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

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

(1) Tested GE 6CN7 Tube Red Letter Date Code 61-26 General Electric Diode Triode

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

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

(1) Tested RCA 6Q7GT Tube Date Code YJL Twin Diode High Mu Triode Tube

(1) Tested RCA 6GF7A with Box Date Code VWJY RCA 6GF& A Dual Triode Tube