Network tube radios '' Promin '', '' Promin-2 '' and '' Promin-M ''.
Network tube radiosDomesticNetwork tube radios "Promin", "Promin-2" and "Promin-M" from 1963, 1964 and from 1965 were produced by the Dnepropetrovsk radio plant. Radiola of the third class "Promin" is a four-lamp radio receiver combined with a universal 3-speed electric player EPU-5. Ranges: DV 150 ... 408 kHz, SV 520 ... 1600 kHz and survey HF 3.95 ... 12.1 MHz. Sensitivity in the ranges DV, SV 200 µV, KV 300 µV. IF 465 kHz. Adjacent channel selectivity 30 dB. The nominal output power of the amplifier is 0.5 W. The range of reproducible frequencies when receiving is 150 ... 3500 Hz and when listening to a gram recording is 150 ... 5000 Hz. Power consumption 45 W when receiving and 60 W when playing records. The radio acoustic system consists of two loudspeakers of the 1GD-9 type. The dimensions of the radio are 440x260x320 mm. Weight 11 kg. Since 1964, the plant has been producing the Promin-2 radio, similar in design and appearance to the one described, but with the VHF range instead of HF. The electrical circuit was redesigned, due to which the sensitivity of the AM path increased, and the reproducible frequency band increased to 100 ... 4000 Hz when receiving in the AM bands and 100 ... 7000 Hz when receiving in FM and listening to a recording. In 1965, the radiola was upgraded to the Promin-M model. Due to the low sensitivity in the VHF range, the small number of stations and the limited range of them, the models again returned the survey range of short waves. The scheme of the model was again redesigned, new loudspeakers 1GD-28 were used in the speaker system, many parameters of the model began to comply with GOST for 2nd class receivers. The appearance, dimensions and weight of the radio, with minor exceptions for the false panel, have practically not changed. The price for the Promin-2 radio was 69 rubles.
