(1) Tested RCA 6GH8A Tube with Box Date Code HE Triode Sharp Cutoff Pentode Tube

(1) Tested Strong RCA 6EH5 Tube with Box Date Code ED Pentode Tube

(1) Tested RCA 6BR8A Tube with Box Date Code CB RCA Triode Pentode Tube

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

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

(1) Tested Sylvania 6JC8 Tube with Box Date Code NR EDF Triode Pentode Tube

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

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