(1) Tested RCA 6CX8 Tube with Box Date Code CR Medium Mu Triode Pentode Tube

(1) Tested RCA 6CX8 Tube with Box Date Code DM Medium Mu Triode Pentode Tube

(1) Tested Relay 6CX8 Tube Date Code 6-66 Medium Mu Triode Pentode Tube

(1) Tested RCA 6KA8 Tube with Box Date Code GJ Triode Pentode Tube

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

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

(1) Tested RCA 35DZ8 Tube with Box Date Code MI High Mu Triode Power Pentode

(1) Tested RCA 5BR8 Tube with Box Date Code AQ Medium Mu Triode Cutoff Pentode