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

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

(1) Tested Philco 6AU6 Tube Date Code 3031 Philco 6AU6 Sharp Cut Off Pentode

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

(1) Tested Philco 6BH6 Tube with Box Sharp Cutoff Pentode Tube

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