The 7788 Amperex Vacuum Tube, TV-7D is a vintage audio and video component that has been tested and is in working condition. This vacuum tube is a classic piece of electronics history, manufactured in the United States by Amperex. With its model number TV-7D, this tube is a valuable addition to any vintage audio collection, offering a piece of nostalgia from the golden age of television and electronics. Whether for restoration or collection purposes, this Amperex vacuum tube is sure to delight any vintage electronics enthusiast.