This is a high-quality TELEFUNKEN ECF83 tube that is perfect for vintage audio and video equipment. The tube is in its original box and has never been opened, making it an excellent choice for collectors. It is a NOS tube that is sure to provide reliable performance and has been well-maintained to ensure its longevity.

The brand of the tube is TELEFUNKEN, which is known for producing high-quality audio equipment. The model is ECF83, which is a popular choice for vintage audio enthusiasts. This tube is perfect for use in vintage audio and video equipment, as well as in modern equipment.