This vintage vacuum tube is a quality product manufactured by RFT in Germany. It is a 100 watt tube for Freya EW radar , type model RS391, and is designed as a transmitting pentode that is air cooled. This unit type tube is perfect for vintage audio and video enthusiasts looking for a unique piece to add to their collection. The tube is in good working condition and has been tested to ensure it functions properly. Add this rare piece to your collection today!