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

(1) Tested Strong Raytheon 6DW4B Tube Date Code W04 Half Wave Rectifier

(1) Tested Strong Sylvania 6DW4B Tube Date Code KUA Half Wave Rectifier

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

(1) Tested Strong RCA 17D4 Tube Code NG Half Wave Rectifier Tube

(1) Tested Very Strong RCA 6AF3 Tube with Box Date Code ND Half Wave Rectifier

(1) 6DW4B Tube Half Wave Vacuum Rectifier (Japan)

(1) Tested Triad GE 6AX4GT Tube Made in Japan 6AX4 GT Half Wave Rectifier Tube