(1) Tested Sylvania Type 27 Tube Date Code 13R Medium Mu Triode Tube

(1) Tested Sharp Japan 17JZ8 Tube Date Code 8-7 Medium Mu Triode Power Pentode

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

(1) Tested RCA Radiotron Type 27 Tube Date Code T6 Medium Mu Triode Tube

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

(1) Tested RCA 6BQ7A Tube Date Code MZ RCA 6BQ7 A Medium Mu Twin Triode Tube

(1) Tested Philco 6J6 Tube Date Code 50-16 Medium Mu Twin Triode 6J6 S Tube

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