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Portable radio "Sokol-403" from the set of designer since 1971 produced the Moscow radio plant. The radio constructor set is designed to assemble and configure the Sokol-403 radio receiver similar to the industrial one, but in the case of the Sokol radio receiver. The radio board was supplied assembled and pre-configured. It was necessary to assemble a vernier device, unsolder the wires to the loudspeaker, battery, antenna and telephone. After that, the avometer checked transistor modes and made a more fine adjustment of the circuits using an avometer and an additional radio tuned at the factory.