(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 6JC8 Tube with Box Date Code SC General Electric Triode Pentode

(1) Tested GE 1L4 Tube with Box Date Code 60-48 General Electric Pentode Tube

(1) Tested GE 6ES5 Tube with Box Date Code JE General Electric Triode Tube

(1) Tested GE 6JD6 Tube with Box Date Code FK General Electric Pentode Tube

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

(1) Tested Sylvania 12JN8 Tube with Box Date Code ZAB Triode Pentode Tube