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

(1) Tested GE 5AN8 Tube with Box Date Code 59-04 General Electric Triode Pentode

(1) Tested GE 5X8 Tube with Box Date Code FV General Electric Triode Pentode

(1) Tested GE 6JV8 Tube and Box Date Code NJ General Electric Triode Pentode (b)

(1) Tested GE 6JV8 Tube and Box Date Code NJ General Electric Triode Pentode (a)

(1) Tested RCA 6KA8 Tube with Box Date Code GJ Triode Pentode Tube