(1) Tested RCA 5CG8 Tube with Box Date Code KR Triode Pentode Tube

(1) Tested RCA 6EH8 Tube with Box Date Code CQ Triode Pentode Vacuum Tube

(1) Tested Sylvania 6JT8 Tube with Box Date Code bk Sylvania 6JT8 Triode Pentode

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

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

(1) Tested Truetone 6CR6 Tube with Box Date Code 617 Diode Pentode Tube (b)

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