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

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

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

(1) Tested GE 5GH8 Tube with Box Date Code JC General Electric Triode Pentode

(1) Tested RCA 6AZ8 Tube with Box Date Code KG Medium Mu Triode Cutoff Pentode

(1) Tested GE 6CU8 Tube with Box Date Code LW General Electric Triode Pentode

(1) Tested Motorola 6BL8 Tube Date Code 7M-431 Made in Japan Triode Pentode Tube

(1) Tested GE 6AT8 Tube with Box Date Code 60-43 Triode Pentode Converter Tube