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Since 1929, battery-type radio receivers of the RKE-2 and RKE-3 types have been manufactured by the Leningrad Kozitsky Plant. '' RECE-3 '' (Regenerative Short-Wave Shielded, 3-tube) is an amateur radio receiver designed to receive short waves in the range of 13 ... 98 m. According to the circuit, the receiver is a regenerator without high-frequency amplification according to the Schnell circuit (with feedback control variable capacitor) with 2 cascades of bass amplification on transformers. The RECE-2 receiver (Regenerative, Short-wave, Screened, 2-tube) according to the scheme and design is completely similar to the REC-3 receiver, but instead of two low-frequency amplification stages, it has one. Radio "EKE-3" was produced in the form of a set of designer for self-assembly.