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

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

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

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

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

(1) Tested RCA 6KA8 Tube with Box Date Code GJ Triode Pentode Tube

(1) Tested RCA 6BH8 Tube with Box Date Code BZ 6BH8 Triode Pentode Tube

(1) Tested RCA 3BC5 Tube with Box Date Code KQ Sharp Cutoff Pentode Tube