Thank you for viewing. Toshiba / Mazda UZ-42 vacuum tube, with original box. Since I do not have measuring instruments or an operating environment, the item's operation has not been confirmed. It is a long-term storage item that has only naturally deteriorated in a cool, dark place. Due to its age, it is sold as-is, for those who can understand and accept its current condition. Please check the condition in the photos. Everything shown in the photos is included. Thank you.