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Radio "R-252" (Valley) was produced since 1954. The range of 75 ... 2000 kHz, is divided into 6 subranges. Lamp 14/15. This and the models "Р-251", "Р-310" are similar in appearance, slightly differing in design, year of release, ranges. Sensitivity TLF 12, TLG 2 µV. 1 conversion on 1 subband and 2 on the rest.