(1) Tested GE 3AV6 Tube with Box Date Code 61-17 Twin Diode High Mu Triode

(1) Tested Sylvania 3AV6 Tube with Box Date Code ACG Twin Diode High Mu Triode

(1) Tested Sylvania 6BJ8 Tube with Box Date Code ER DHL Twin Diode Triode

(1) Tested RCA 6AT6 Tube with Box Date Code BF Twin Diode High Mu Triode Tube

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

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

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

(1) Tested Strong Dumont 6J6 Tube with Box Date Code 57-43 Medium Mu Twin Triode