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Radio "R-312" (Beta) was produced since 1954. Radio "R-312" is intended for the organization of radio communications and radio monitoring in the Soviet Army. The radio receiver is assembled on ten radio tubes of type 2Ж27Л and operates in five sub-bands with smooth overlapping of frequencies from 15 to 60 MHz, with sufficient reserves at the edges of the sub-bands. The receiver can receive radio stations working with AM, FM and tone modulation, as well as telegraph and signals from a suppressed carrier. When receiving AM-FM stations, the sensitivity is 5 ... 8 µV, and when receiving the telegraph and SSB - 2 ... 3 µV. The radio receiver has a two-stage adjustment of the bandwidth on the IF which switches automatically when modulation is selected. When receiving AM signals, the IF bandwidth can be changed from 9 kHz at a narrow band, to 25 kHz at wide, at reception of FM signals from 60 and up to 180 kHz, respectively, at reception of telegraph signals and SSB from 3 to 9 kHz. When a powerful signal is very noticeable signal bursts outside the 3 kHz band. The receiver has a mode for receiving CW signals using the beat method between sound frequencies, the so-called tone modulation. The adjacent channel selectivity is 74 db, and this is the maximum value when receiving CW - SSB, in the mirror one from 36 to 60 db. The IF is 3 MHz. The receiver is powered by 2.5 V batteries, which feed the lamp heat directly, and the anodes of the lamps are fed through a vibrator with an output voltage of 80 volts. The current consumption on the anode is not more than 25 ma, on the heat of 0.7 a. The power amplifier low frequency 50 MW. Dimensions 445x290x255 mm, weight 20 kg.