[en] In this paper the working principle of a magnetron is examined from the standpoint of the accomplishing of the necessary transformation of this device. The working is explained of the electric generator with radioisotopes as well as of the converting cell of the fission nuclear energy by using a modified magnetron. Both the electric generator with radioisotopes and the converting cell of the fission nuclear energy represent energy sources supplied in the form of micro-waves - the main power source - and of direct current - the secondary reduced power source