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Since the beginning of 1958, the network lamp crystal "Kristall" has been produced at the Riga State Electrotechnical Plant "VEF" with an experimental series in 3 versions, with a keyboard tone register (tone control) and an automatic tuning mechanism, a wired remote control like a radio receiver, with Tonregisters located on the volume and settings controls and without tonregisters like the "Latvia" and "" Lux "radios. Technical parameters, el. The design and construction of the radiograms practically coincide with the radio "Russia" and the radio "Lux". All the differences in the performance of the case and the speaker system with the so-called surround sound, which of the radio consists of two low-frequency loudspeakers 4ГД-1 installed on the left, on the front panel, one 3G-7 which performs the functions of mid-frequency. It stands on the right side of the front panel, as well as two HF VGD-1 installed on the front panel in the middle and two of the same VGD-1 or 1 GD-9 installed on two side walls and reproducing medium and high frequencies. Speaker radios have high electroacoustic data. The range of reproducible sound frequencies extends from 30 Hz to 18 kHz with a 10 dB rise at the edges. Radiol has 14 finger radio tubes: 6N3P, 6I1P, 6K4P (3 pieces), 6H2P, 6N1P, 6N2P (2 pieces), 6P14P (4 pieces) and 6E1P. A variant of a stereo radiola with a 2nd acoustic system and a PPDU (main image) was developed. In 1959 he developed a radiocamera "Crystal-2" with high acoustic parameters, which remained only an exhibition copy.