Sorry, this page is not translated yet. Automatic translation used.
From the middle of 1930 to the year of the year, the Moscow Electrotechnical Plant Moselektrik produced a small series of a radio receiver network lamp "EShS" (EShS-1) The EShS receiver was developed at the end of 1929 by the Leningrad Central Radio Laboratory of VEO and in December 1929 transferred to serial production at the Moselektrik plant. Comprehensive testing of the receiver by the plant showed that it works quite mediocre, in any case, it is not better than the serial reception of the "warhead". The radio was rejected and reprocessed. As a result of modernization, a receiver with the name "ESD-1" was prepared for serial production, however later in life and in technical documentation it was called "ESD". The "EFS" (EFS-1) receiver (shielded, four-lamp, mains) is the first radio receiver with full power supply from the AC mains, assembled according to the direct amplification circuit 1-V-2 with inductive-capacitive feedback. In the high-frequency amplifier, the CO-95 lamp was shielded, heated, with a gain of 200. Detection (grid) was carried out with a PO-74 lamp (an oxide receiver with heating). The low-frequency amplifier had 2 amplification stages on transformers. The TO-76 lamp (thoriated, oxide) worked in the first cascade. A thick filament lamp allowed for alternating current. At the output of the receiver was a UK-30 type lamp (carbonated reinforcement), which was an improved sample of the UT-15 type lamp. Her thoriated thread was covered with a layer of coal, which made it impossible for thorium to escape from the thread during the breaks and made it possible to power the lamp with alternating current. The receiver was powered from a rectifier working on two UT-1 lamps (the K2-T kenotrons were too low). The EShS receiver in the spring of 1931 was replaced with a new, improved EShS-2 receiver, in which new lamps were used.