(1) Tested Very Strong GE 6JC8 Tube with Box Date Code CV Triode Pentode Tube

(1) Tested GE 6JC8 Tube with Box Date Code SC General Electric Triode Pentode

(1) Tested Sylvania 6JC8 Tube with Box Date Code NR EDF Triode Pentode Tube

(1) Tested Strong Sylvania 6JC8 Tube Date Code NR JAG Triode Pentode Tube

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

(1) Tested Philco 6AU8A Tube with Box Date Code 6504 Triode Pentode

(1) Tested GE 6JV8 Tube with Box Date Code FI General Electric Triode Pentode

(1) Tested Strong Sylvania 6JC6A Tube with Box Code ae AKN 6JC6 A Pentode Tube