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

(1) Tested RCA 5X8 Tube with Box Date Code KP Triode Pentode Tube

(1) Tested Sylvania 5X8 Tube with Box Date Code df JAS Triode Pentode Tube

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

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

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

(1) Tested GE 1A5GT Tube Date Code 8-39 General Electric 1A5 GT Pentode Tube (b)

(1) Tested Strong GE Compactron 6AG9 Tube General Electric 6AG9 Triode Pentode