This vintage vacuum tube is a rare find for any audio or electronics enthusiast. Made by RWN and with the model EF86, this unit type vacuum tube has been tested on Roetest V10 and is 100% functional. It belongs to the vintage tubes and tube sockets category, and is a perfect fit for vintage audio and video equipment. The brand and model are highly sought-after, making it a valuable addition to any collection. This tube is compatible with a variety of devices and is sure to enhance the sound quality of any system it is used with.