(1) Tested RCA 6EB8 Tube Date Code AP High Mu Triode Pentode Tube

(1) Tested RCA 6AW8A Tube and Box Date Code BH 6AW8 A High Mu Triode Pentode (a)

(1) Tested RCA 6AW8 Tube with Box Date Code BKP 6AW8 High Mu Triode Pentode

(1) Tested Tung Sol 5U8 Tube Date Code KA3 Triode Pentode Tube

(1) Tested Tung-Sol 6AW8A Tube Tung Sol 6AW8 A High Mu Triode Cut Off Pentode

(1) Tested Raytheon 6AN8 Tube Date Code 643 Triode Pentode Tube

(1) Tested Strong Sylvania 6JC8 Tube Date Code NR JAG Triode Pentode Tube

(1) Tested Westinghouse 6EB8 Tube Date Code 69-22 High Mu Triode Pentode Tube