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Since 1960, the portable radio "Leningrad" has experimentally produced the Leningrad Mechanical Plant "Leninets" (presumably). In 1960, about 20 receivers were released, with respect to serial production began from 1961 onwards. A portable experimental all-wave exhibition transistor radio '' Leningrad '' has been on display in the 'Radio Electronics' pavilion at the Exhibition of Economic Achievements of the USSR since the beginning of 1959. It is assembled on 10 transistors, its output power is 0.5 watts. The radio receiver has 7 ranges: LW, MW, and five HF sub-bands. It is powered by eight "Saturn" type cells with a total voltage of 12 V. A special power stabilizer ensures the normal operation of the radio receiver (its high electrical and acoustic parameters) when discharging batteries from 12 to 8 volts. One set of power is enough for two months, if you use the receiver no more than 3 ... 4 hours a day. Reception can be conducted on the telescopic antenna in the HF range, on the built-in ferrite on long and medium waves and on the outside in all ranges. In the design of the radio receiver, an effective AGC is used that ensures the reception of radio stations of various power and remoteness with the same loudness; Volume and tone controls are also provided. The radio "Leningrad" was created on the basis of the receiver "Trans-Oceanic Royal-1000" - 1957, the American company "Zenith", see the last photo. In 1961, the somewhat modernized Leningrad radio receiver began to be mass-produced. It is also assembled on 10 transistors and has seven ranges. Sensitivity to a magnetic antenna in the range of DV - 1 mV / m, SV - 0.25 mV / m, in the ranges of KV to a telescopic antenna ~ 10 μV. The adjacent channel selectivity is 36 dB. Rated output power 0.5 watts. The range of reproduced sound frequencies is 80 ... 4500 Hz. In addition to the standard ranges of DV and CB, the HF range has five subranges; these are 13 meters (13.7 ... 14.1), 16 meters (16.5 ... 17.1), 19 meters (19.3 ... 20.1), 25 ... 31 meters ( 25..32) and 41-49 meters (41 ... 51). The receiver has two magnetic antennas, one built-in, another portable on suckers. The remote antenna is used both to provide round-robin reception, and to tune away from interfering stations or interference. The upgraded receiver was produced in a small series, the assembly was manual. The name plate on the back cover of the receiver says: '' GNRE USSR model L-D N088 Leningrad 1961. The manufacturer is not exactly installed, but perhaps it is the Leningrad plant '' Innovator '' which later entered the Leningrad Central Scientific Industrial Association. According to other sources, this could also be an institute "NII-131", more precisely, the plant of one of the design bureau (283, 287 or 794).