FIELD: direct conversion of heat energy to electric one, mainly thermoionic energy conversion. SUBSTANCE: generator has a body with evaporation and condensation zones and steam throttling and extraction devices located in the evaporation zone, and a system, used for returning the condensed working medium, in the form of a tube positioned outside the body, which provides conditions for thermovacuum preparation. The tube with a recommended diameter and length may be furnished with a heater, temperature-measuring elements, filter of oxides and other working medium compounds. EFFECT: enhanced efficiency. 6 cl, 1 dwg
