Russian Svetlana GU-74B transmitting tube with date code 9208 and S/N 19594 Purchased around 2005, and remained in heated dry storage since then. Item has never been used. NOS. This was bought without a warranty and sold as such as I don't have control of how its conditioned or used electrically As with all NOS tubes of this type its essential to condition them for 12 hours filaments only no EHT to allow the getters to do their work and avoid possible internal flashover
