(1) Tested RCA 6T8A Tube RCA 6T8 A Triple Diode High Mu Triode Tube

(1) Tested GE 6T8A Tube GE 6T8 A Triple Diode High Mu Triode Tube (b)

(1) Tested GE 6T8A Tube GE 6T8 A Triple Diode High Mu Triode Tube

(1) Tested Sylvania 6T8A Tube with Box Code ag ESZ Triple Diode High Mu Triode

(1) Tested Tung Sol 6T8 Tube Code 5708-1 Triple Diode High Mu Triode Tube

(1) Tested Sylvania 6T8A Tube Date Code ab ESO Triple Diode High Mu Triode Tube

(1) Tested GE 6T8A Tube with Box Code 63-26 Triple Diode High Mu Triode Tube

(1) Tested Raytheon 6T8A Tube and Box Japan Code Q08 Triple Diode High Mu Triode