Sylvania 5U4 5U4G Vacuum Tube Rectifier Black Plate Shoulder ST Variety 52nd Street These three Sylvania plate number

These three Sylvania plate number 78 tube were tested on our Paul Hart-calibrated TV7/U for shorts

These tubes all have small logos as well as 048

new in box Sylvania 2A4G tube tested to spec

One can adjust the time

Sylvania 5U4 5U4G Vacuum Tube Rectifier Black Plate Shoulder ST Variety 52nd Street These three Sylvania plate numberThis Sylvania 5U4G rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas. It measured 56 52 where minimum (65%) is 40 40 and 100% is 62 62. This tube has 439 C date codes, a bottom, D getter and nice flashing. There is some cathode coating that has shed from the filaments. Please see picture. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE