(1) Tested Tung Sol 5U8 Tube Date Code KA3 Triode Pentode Tube

(1) Tested Zytron 5U8 Tube Date Code 709 Triode Pentode Tube

(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 RCA 6AU8 Tube with Box Date Code KQ Triode Pentode Tube

(1) Tested RCA 5AN8 Tube with Box Date Code KQ Triode Pentode Tube

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

(1) Tested Tung-Sol 6CR6 Tube with Box Date Code K03 Tung Sol Diode Pentode Tube