Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven 58 and 71 where minimum

58 and 71 where minimum (65%) is 50

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

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

Tube One measured 64 while Tube Two measured 66 where minimum (65%) is 46 and 100% is 71

a thimble getter and excellent flashing

Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven 58 and 71 where minimumThis 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