Sylvania Black Plate 5U4 5U4G Hanging Filament Vacuum Tube Rectifier Shoulder ST Shape Synergy Vinyl LP new in box International Servicemaster

new in box International Servicemaster 19CG8 tube tested to spec on our Paul Hart-calibrated TV7/U

Their readings are 54

new in box IEC 12W6GT tube tested to spec on our Paul Hart-calibrated TV7/U tube tester

mesh plates

Sylvania Black Plate 5U4 5U4G Hanging Filament Vacuum Tube Rectifier Shoulder ST Shape Synergy Vinyl LP new in box International ServicemasterThis Sylvania hanging D filament 5U4G rectifier tube tested 53 in Section One and 54 in Section Two on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 and 100% is 62 62. It has a 5MR date code; a bottom D or perhaps U getter and mica snubbers. IT HAS HAD SOME OXIDE SHEDDING. PLEASE SEE PICTURE. 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" AND OR CALL OR