Sylvania Black Plate 5U4 5U4G Hanging Filament Vacuum Tube Rectifier Shoulder ST Shape 6MV8 Nonal T24 53/50 and 60/61 where minimum

53/50 and 60/61 where minimum (65%) is 38/38

They have double O getters

Tube One measured 80/80 while Tube Two measured 82/84 where minimum (65%) is 50/50 and 100% is 77/77

There were no shorts or gas and it measured as follows:

100% is 62/62

Sylvania Black Plate 5U4 5U4G Hanging Filament Vacuum Tube Rectifier Shoulder ST Shape 6MV8 Nonal T24 53/50 and 60/61 where minimumThis Sylvania MANUFACTURED, Admiral BRANDED hanging filament 5U4G rectifier tube tested 54 in Section One and 56 in Section Two on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 and 100% is 62 62. It has a 312 813 provenance date code; underwhelming flashing; a bottom D or perhaps U getter and wire snubbers. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO"