(1) Tested RCA 6DE4 Tube Date Code BV 6DE4 Half Wave Rectifier Vacuum Tube

(1) Tested Sylvania 6DE4 Tube Date Code aa EDP Sylvania 6DE4 Half Wave Rectifier

(1) Tested Sylvania 6DE4 Tube Date Code am EEL Sylvania 6DE4 Half Wave Rectifier

(1) Tested RCA 6DE4 Tube with Box Date Code AL RCA 6DE4 Half Wave Rectifier

(1) Tested RCA 6W4GT Tube Date Code 0-48 RCA 6W4 GT Half Wave Rectifier

(1) Tested Strong RCA 6DW4B Tube Date Code B4 Half Wave Rectifier

(1) Tested Strong RCA 19AU4GTA Tube Date Code LZ 19AU4 GTA Half Wave Rectifier

(1) Tested 1966 Philco 6DE4 Tube Date Code 66-30 6DE4 Half Wave Rectifier Tube