Sylvania Wizard Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging Filaments American NOS NIB This tube has two additional

This tube has two additional vertical support rods

This paperback book is in very good shape with the vestige of a sticker on the bottom spine area

new in box GE 6SS7 tube tested to spec on our Paul Hart-calibrated TV7/U

It measured an almost-perfectly-balanced 71/72 where minimum (65%) is 56/56 and 100% is 86/86

This perfectly-matched septet of new old stock-testing Sylvania 7A7 tubes was tested on our Hickok 800 for shorts

Sylvania Wizard Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging Filaments American NOS NIB This tube has two additionalThis (most likely) Sylvania MANUFACTURED Wizard BRANDED number type 80 rectifier tube was tested on our Paul Hart calibrated TV7 U. It measured 50 46 where minimum (65%) is 40 40 and 100% is 62 62. It has a dimpled sheet getter; an engraved base; hanging filaments and outstanding flashing. 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 TEXT US AT 202