(1) TestedBalanced Sylvania 25Z5 Tube.
(1) Tested Balanced Sylvania 6SA7 Tube Date Code 352 Pentagrid Converter
(1) Tested Balanced Sylvania 25Z5 Tube with Box Date Code 2-26 Rectifier Doubler
(1) Tested 1938 Sylvania 6K7G Tube Date Code V9R Sylvania 6K7 G Pentode Tube
(1) Tested Strong Sylvania 6W4GT Tube Date Code 418 Sylvania Green Logo 6W4 GT
(1) Tested Strong Sylvania 6DJ8 Tube Date Code 244 EDD Vintage Twin Triode Tube
(1) Tested Balanced RCA 6BL7GTA Tube Date Code BQ RCA 6BL7 GTA Tube Twin Triode
