What Happened to the Lines on Sony Trinitron TVs? Why They Never Disappeared

Those two faint grey lines across a Sony Trinitron screen were never a flaw waiting to be fixed. They were welded in on purpose, on the first tube in 1968 and on the last one in 2008. After a licensed color tube nearly sank the company, Sony built its own. The Trinitron used a single electron gun and a grille of fine vertical wires held under tension, letting about 25 percent more light through than a shadow mask. But tensioned wires ring. Sony welded damping wires across them, and those wires are the lines owners carried back to the store. You will learn: • How the failed Chromatron forced Sony to design the Trinitron • Why the aperture grille beat the shadow mask on brightness • Why damping wires were the only cure for a ringing grille • Why IBM told its own customers the lines were normal • How expiring patents let rivals copy the design • Why the best tube of its era still ended in 2008 If you ever sat close to a white screen and found those two lines, or watched the picture shrink to a white dot at switch-off, share what you remember in the comments. Subscribe for calm, careful histories of the screens we grew up with. #SonyTrinitron #Trinitron #ApertureGrille #CRTTV #TrinitronLines #RetroTV #CRT #SonyTV #VintageElectronics #TVHistory