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

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

(1) Tested RCA 6CY5 Tube with Box Date Code BF Sharp Cutoff Tetrode Tube

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

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

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

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

(1) Tested RCA 12DY8 Tube Date Code BP RCA Triode Tetrode Tube (f)