This vintage vacuum tube is a rare find for collectors and audio enthusiasts. Made by SYLVANIA, this 6SN7GT model is a prime example of vintage electronic engineering from the United States. This unit is in excellent working condition and is a great addition to any vintage audio or video setup. It comes with one unit quantity and is perfect for those who are looking to upgrade their vintage electronics collection. This tube is from the estate of a collector and has not been tested by this seller.