Oniks-401 1973
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The portable transistor radio "Onyx-401" since 1973 produced the Kamensk-Uralsky PSZ. Onyx is translated from the Greek "nail". According to the wiring diagram, the Onyx-401 radio receiver coincides with the Neiva-401, Neiva-402, and Radio Signal-601 serial radio receivers. The radio "Onyx-401" differs from them in the design of the case and controls, which have their own design of the vertical vernier device. For all the main technical characteristics, such as sensitivity, selectivity, output power and other listed radio receivers are identical.
Information from collection of Valery Khartchenko