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Radio "Amethyst" in 1958 was developed at the Riga State Electrotechnical Plant "VEF". Amethyst high-end radio receiver is similar in design and wiring diagram to the Kristall radio line of the same plant. The appearance in the case, the absence of EPS and in the applied acoustic system. The sound system of the radio receiver consists of two 4GD-1 low-frequency loudspeakers installed on the left side of the front panel and connected in series, a 3GGD-7 mid-frequency loudspeaker installed on the right side of the front panel, a high-frequency IGD-1 loudspeaker installed also on the front panel in the middle two VGD-1 or 1GD-9 loudspeakers installed on the side walls of the box, reproducing medium and high frequencies. According to the characteristics, except for the range of reproducible frequencies, the receiver coincides with the characteristics of the radioli. The frequency range of the radio receiver when receiving VHF-FM programs is 75 ... 15000 Hz.