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

(1) Tested Raytheon 6CY5 Tube Japan with Box Date Code S-02 Tetrode Tube

(1) Tested RCA 6CY5 Tube with Box Date Code DR Screen Grid Tetrode Tube

(1) Tested GE 6CY5 Tube Date Code FE General Electric Screen Grid Tetrode Tube

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

(1) Tested Sylvania 6CY5 Tube with Box Date Code ha ABO Tetrode Tube

(1) Tested Strong Sylvania 6CY5 Tube with Box Date Code GK BDT Tetrode Tube

(1) Tested GE 6CY5 Tube Date Code RV General Electric Screen Grid Tetrode Tube