Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven Tube One measured 64 while

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

58 and 71 where minimum (65%) is 50

a thimble getter and excellent flashing

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

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

Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven Tube One measured 64 whileThis 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