This Eimac 4-400a transmitting tube is a vintage piece of electronics from the United States. It is a high-quality tube that was designed for transmitting purposes, making it a great addition to any vintage audio or video collection. With its brand name and model number, this tube is sure to impress any electronics enthusiast.The tube is in good condition and has been well-preserved over the years. It is a valuable piece of history that deserves a new home where it can be appreciated for years to come. This tube is perfect for collectors and hobbyists alike, and is sure to make a great addition to any vintage electronics collection.