Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven a top slanted-D getter and

a top slanted-D getter and L1E -- or IJI -- date codes

a thimble getter and excellent flashing

This matched pair of Sylvania-MANUFACTURED 6X5GT rectifier tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 22JR6 tubes tested to spec on our on our Jackson 648

This new old stock-testing Svetlana 6550C / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven a top slanted-D getter andThis black plate Sylvania 5U4GB rectifier tube tested 52 48 in Sections One and Two, respectively, on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 and 100% is 62 62. It has a top O getter; a crenelated top mica spacer; black plates and jd AED date codes. THIS TUBE'S CENTERING PIN IS MISSING AND IT HAS BEEN MARKED FOR SAFE AND EASY INSERTION. THERE IS A CLOSE UP PHOTO OF THE BASE TO SERVE AS A REMINDER. WE HAVE SCORES OF THOUSANDS OF