(1) Tested RCA 8CX8 Tube with Box Date Code BJ Triode Pentode Tube

(1) Tested RCA 6JV8 Tube and Box Date Code BZ Triode Pentode Tube (b)

(1) Tested Strong RCA 6JH6 Tube with Box Date Code CA RCA Pentode Tube

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

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

(1) Tested Strong RCA 6AK6 Tube and Box Date Code 6726 Power Amplifier Pentode

(1) Tested RCA 6AZ8 Tube with Box Date Code KG Medium Mu Triode Cutoff Pentode

(1) Tested RCA 15BD11A Tube with Box Date Code FW Double Triode Pentode Tube