(1) Tested Admiral 8FQ7 Tube Date Code 270-17 Japan Medium Mu Twin Triode Tube

(1) Tested Sylvania 17JZ8 Tube with Box Date Code dg AOR Triode Beam Pentode

(1) Tested Sylvania 5CL8A Tube Date Code da AGD Medium Mu Triode Sharp Tetrode

(1) Tested Sylvania 6N7 Tube Date Code 8-26 Medium Mu Twin Power Triode Tube

(1) Tested Zenith 6KA8 Tube Date Code 72-17 Great Britain Triode Pentode Tube

(1) Tested RCA 6AZ8 Tube with Box Date Code KG Medium Mu Triode Cutoff Pentode

(1) Tested Philco 8FQ7 Tube Date Code N-41 Japan Medium Mu Twin Triode Tube

(1) Tested Sylvania 6JZ8 Tube with Box Date Code hl AAO Medium Mu Triode Pentode