Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine Eleven

Sylvania 5U4 5U4GB Vacuum Tube Rectifier Black Plate Nine ElevenThis 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

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

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

but I glued it anyway

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

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

It has flat

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

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

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

Transconductance measured 72 for Tube One and 76 for Tube Two where minimum (65%) is 58