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

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

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

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

(1) Tested RCA 6X8 Tube with Box Date Code 4-52 Triode Pentode Converter Tube

(1) Tested Sylvania 6JV8 Tube with Box Date Code NR AAA Triode Pentode Tube

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

(1) Tested Sylvania 5X8 Tube Date Code GL ELM Triode Pentode Converter Tube