This listing is for a set of two AEG 5654 tubes, which were manufactured by Telefunken and are in new old stock condition. These tubes have been tested and are guaranteed to be in perfect working order. These tubes are an excellent choice for anyone who is looking to upgrade their audio equipment. With their lifetime manufacturer warranty and high-quality construction, you can be confident that these tubes will provide reliable and high-performance operation for years to come. Don't miss out on this opportunity to improve your audio setup with these top-quality tubes.