This vintage audio tube set includes two pieces of the U52 (5U4G) OSRAM (GEC) NOS tube, manufactured in the United Kingdom. With a brand name of OSRAM, these tubes are of high quality and are sure to enhance the sound quality of any vintage audio equipment they are used with. Ideal for collectors and enthusiasts of vintage electronics, these tubes are categorized under Vintage Tubes & Tube Sockets, Vintage Parts & Accessories, Vintage Audio & Video, and Consumer Electronics. Their type is a NOS tube, meaning they are new old stock and have never been previously used. Invest in these authentic and rare pieces to elevate your vintage audio experience.