Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven This new old stock-testing Svetlana

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

RCA-BRANDED 6HG8 / ECF86 tubes tested to spec on our Paul Hart-calibrated TV7/U

58 and 71 where minimum (65%) is 50

new in box Realistic (Radio Shack) Gold Clad Japanese-made 6AU6A tubes tested to spec on our Paul Hart-calibrated TV7/U: 75

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

Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven This new old stock-testing SvetlanaThis 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