(1) Tested Very Strong RCA 6BK5 Tube with Box Date Code CL RCA 6BK5 Tube (c)

(1) Tested Strong RCA 2CY5 Tube with Box Date Code EA Sharp Cutoff Tetrode Tube

(1) Tested Strong Sylvania 6CS6 Tube with Box Date Code ig JAM Heptode Tube

(1) Tested Strong RCA 6AS5 Tube with Box Date Code CJ RCA 6AS5 Beam Power Tube

(1) Tested Strong RCA 12H6 Tube with Cleaver Brooks Box Date Code DE Diode (b)

(1) Tested Sylvania 12EG6 Tube with Box Date Code NR YAU Heptode Tube (a)

(1) Tested Strong RCA 6BK5 Tube with Box Date Code AY Beam Power Tube

(1) Tested Very Strong RCA 6BK4B Tube with Box Date Code CB Diode