Sylvania 5U4 5U4G Vacuum Tube Rectifier Black Plate Shoulder ST Variety 52nd Street 64 and 72 where minimum

64 and 72 where minimum (65%) is 45 and 100% is 69

One can adjust the time

new in box Sylvania 2A4G tube tested to spec

These tubes all have small logos as well as 048

This lot of eight 6CG7 / 6FQ7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Sylvania 5U4 5U4G Vacuum Tube Rectifier Black Plate Shoulder ST Variety 52nd Street 64 and 72 where minimumThis 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