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

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

(1) Tested Sylvania 12JN8 Tube with Box Date Code NR AAA Triode Pentode Tube (b)

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

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

(1) Tested Sylvania 6JZ8 Tube with Box Date Code hl AAO Medium Mu Triode Pentode

(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