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

(1) Tested RCA 5CG8 Tube with Box Date Code KR Triode Pentode Tube

(1) Tested Strong RCA 6CL6 Tube Date Code EK RCA 6CL6 Power Pentode Tube (d)

(1) Tested Sylvania 3BY6 Tube with Box Date Code CB Pentagrid Amplifier Tube (c)

(1) Tested RCA 9AU7 Tube with Box Date Code BG RCA 9AU7 Double Triode Tube

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

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

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