(1) Tested Zenith 6AY3 Tube Zenith Half Wave Rectifier Tube

(1) Tested Sylvania 6AY3 Tube with Box Date Code mk RAF Half Wave Rectifier

(1) Tested Magnavox 6AY3 Tube Date Code 64-52 Half Wave Rectifier Tube

(1) Tested GE 6AX3 Compactron Tube with Box Date Code JF Half Wave Rectifier

(1) Tested Sylvania 6CL3 Tube with Box Date Code NR Half Wave Rectifier Tube

(1) Tested RCA 17AY3 Tube with Box RCA 17AY3 Half Wave Rectifier Tube

(1) Tested RCA 6CK3 Tube with Box Half Wave Rectifier Tube

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