(1) Tested GE 6EB8 Tube Date Code JU 6GN8 High Mu Triode Pentode Tube

(1) Tested Cornell 6EB8 Tube Date Code XRMT-PNH 6GN8 High Mu Triode Pentode Tube

(1) Tested GE 6EB8 Tube General Electric 6GN8 High Mu Triode Pentode Tube

(1) Tested Westinghouse 6EB8 Tube Date Code 69-22 High Mu Triode Pentode Tube

(1) Tested Philco 6JE8 Tube Date Code EBF High Mu Triode Sharp Cutoff Pentode

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

(1) Tested Sylvania 10GN8 Tube Date Code 1F High Mu Triode Sharp Cutoff Pentode

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