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

(1) Tested RCA 6CU5 with Box Date Code NF Black Plate Beam Power Pentode Tube

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

(1) Tested RCA 6AG7 Tube Date Code FG5 RCA Black Metal Power Pentode Vacuum Tube

(1) Tested RCA 6CU5 with Box Date Code CV Black Plate Beam Power Pentode Tube

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

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

(1) Tested Strong RCA 8GN8 Tube with Box Date Code AV Triode Pentode Tube