This heavy tank, made in a conventional way, was called Object 770 and constructed by engineer P.P.Isakov at Chelyabinsk (Tankograd). An optical sight (range finder) was meant to be placed in the frontal part of the cast tower. The Tank was equipped with a systems with devices of night vision and a heating system of manned branches. The gearbox had 3 transfers forward and one of backing. A hydropneumatic suspension bracket and the hydraulic mechanism of a tension of tracks was also fitted in to this prototype that never came in to production.