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Thermal generator "TGK-3" since 1953 produced several plants in the country. Not quite radio thematics, but still. Thermal generator "TGK-3" with a capacity of 3 W is designed to power rural battery-type radio receivers such as "Homeland-47", "Homeland-52", "Iskra", "Tallinn B-2", "Tula" and others. Simultaneously with the work of the radio, the lighting was provided by a heating and at the same time a lighting lamp "Lightning", which was important in the evening when people came home from work and wanted to hear the news of the country. The principle of operation of the thermogenerator is based on the effect of heating the alloy of two different metals (thermocouples) where the voltage occurred. The thermogenerator consists of two thermopiles, one of which gives a voltage of 2 V at a current of 0.5 A and feeds the heat of the receiver lamps, the second gives a voltage of 2 V at a current of 2 A and feeds the anodes of the lamps through a vibrator. There is still a tap to power the lamp heat of some receivers with a voltage of 1.2 V and a current of 0.36 A.