(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 Very Strong RCA 2CY5 Tube with Box Sharp Cutoff Tetrode Tube

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

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

(1) Tested GE 2CY5 Tube Green Letter General Electric Sharp Cutoff Tetrode (a)

(1) Tested GE 2CY5 Tube Date Code JT General Electric Sharp Cutoff Tetrode Tube

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