The Amperex 6GB5 / EL500 Electron Tube Beam Tetrode is a vintage audio and TV receiver component known for its superior quality and performance. This unit, made by Amperex, is a collectible item that is highly sought after by enthusiasts and collectors of vintage electronics. With four units available, this product offers a unique opportunity to own a piece of audio history and potentially upgrade or restore a classic television set or audio device.