This vintage Raytheon rectifier tube is a Heintz & Kaufman Gammatron OD3, designed for use in vintage audio and video equipment. The tube is classified under the categories of Vintage Tubes & Tube Sockets, Vintage Parts & Accessories, and Vintage Electronics, and is a great addition to any collection of consumer electronics. The model number for this tube is HEINTZ & KAUFMAN GAMMATRON OD3, and it comes in its original box, making it a perfect gift for any vintage electronics enthusiast.