This vintage vacuum tube is a rare find and a must-have for any serious collector. Made by Arcturus, this unit is a Model 127 with a distinctive blue glass casing. It is a unit type and comes with one tube in the package. The country/region of manufacture is the United States. This tube is perfect for enhancing the quality of your vintage audio and video equipment. The brand Arcturus is known for producing high-quality vacuum tubes, and this Model 127 is no exception. It is compatible with vintage electronics and consumer electronics alike, making it a versatile addition to any collection. Whether you are a collector or an audio enthusiast, this vintage vacuum tube is sure to impress.  This tube is from the estate of a collector and has not been tested by this seller.