Tested Matched Pair RCA 6EM5 Tubes and Boxes Date Codes EK Beam Power Tubes

(1) Tested RCA 6DS5 Tube with Box Date Code ND Beam Power Tube

(1) Tested Strong RCA 6BK5 Tube with Box Date Code AY Beam Power Tube

(1) Tested RCA 6AQ5A Tube RCA 6AQ5 A Date Code 69-39 Beam Power Tube

(1) Tested Delco 6AU5GT Tube Date Code 226 RCA EIA 6AU5 GT Beam Power Tube

(1) Tested RCA 6CU5 with Box Date Code NF Black Plate Beam Power Pentode Tube

(1) Tested Strong Sylvania 6GE5 Tube Date Code md ADX Beam Power Tube

(1) Tested Very Strong RCA 6AV5GA Tube Date Code KV RCA 6AV5 GA Beam Power Tube