(1) Tested ITT 6X8 Tube with Box Date Code 1109 Japan Triode Pentode Converter

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

(1) Tested GE 6X8 Tube with Box Date Code 61-22 Triode Pentode Converter Tube

(1) Tested RCA 6BH8 Tube with Box Date Code BZ 6BH8 Triode Pentode Tube

(1) Tested Motorola 6X8 Tube with Box Code 2-26 Triode Pentode Converter Tube

(1) Tested Tung Sol 6X8 Tube with Box Code KR3 Triode Pentode Converter Tube

(1) Tested Rad-Tel 6X8 Tube Date Code 5-66 6X8 Triode Pentode Converter Tube

(1) Tested Motorola 6X8 Tube with Box Code 62-26 Triode Pentode Converter Tube