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From 1935 to 1937, the radio lamp network and radio radiolourer TsRL-8 was produced by the Leningrad Plant. Kazitsky. Receiver "TsRL-8" was released in a small series, and the radio is a piece. The model was rather complicated and the factories of the accessory companies almost did not release the necessary radio elements, which affected the low-volume and early termination of production. In any case, reference books reflect both devices. Radio "CRL-8" was developed at the end of 1934, and the radio line at the end of 1936. According to the wiring diagram, both models are the same, the differences with regard to the use of EPU only in the design of the case. Radio "TsRL-8" (developed by the Central Radio-Laboratory of Glavasprom, model No. 8) is a first-class superheterodyne-type radio receiver and as an option (radio), in combination with an electro-microphone, a dynamic loudspeaker and a rectifier. Everything is mounted in a general case. The radio receiver and radio is powered by alternating current of 110, 120 or 220 V and covers the radio wave ranges: 17 ... 30 m, 30 ... 60 m, 200 ... 550 m and 714 ... 2000 m, ie the receiver refers to the all-wave group. Laboratory samples of the receiver give a uniform sensitivity of 40 ... 50 µV on all ranges. Gain at the received receiver frequency is carried out by one cascade operating with high-frequency pentode CO-182. The role of the local oscillator, the first detector and the mixer is performed by the pentahydride of the type - SO-183. Gain at the intermediate frequency is carried out by one cascade operating with high-frequency pentode CO-182. After amplification of the IF, signals are sent to the diode part of the double diode-triode of the type CO-185, which produces the rectification of the signals. The resulting inverter voltage is applied to the control grid of the triode of the same lamp and is amplified. Further, the LF amplification is performed by two three-electrode lamps SO-118 and low-frequency pentode SO-187 operating in the final stage. The receiver has a device for automatic volume control, operating from the current of the diode part of the CO-185 lamp.