Sylvania 5U4 5U4G Vacuum Tube Rectifier Black Plate Shoulder ST Variety 52nd Street These tubes all have small

These tubes all have small logos as well as 048

This matched pair of GE-MANUFACTURED 6K6 6K6GT tubes was tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of -36 volts for shorts

This hardcover book -- and its dust jacket -- is in very good condition

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

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 These tubes all have smallThis 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