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The radio network receiver tube Aquamarine was developed in 1955 by the Riga State Electrotechnical Plant VEF. By 1956, the design bureau of the VEF plant had developed a number of high-end radio models, which significantly influenced the development of the Soviet radio industry. Many of the new promising radios were shown at various exhibitions, but were never put on the conveyor. The receivers had a modern design, a large set of functions (automatic tuning, tuners, remote control, VHF range) and high acoustic characteristics. The experienced receiver "Aquamarine" has 7 ranges: DV, SV, KV1..KV4, VHF. The bottom row of keys is a ton-register, a discrete control of the frequency response of the low-frequency amplifier and an automatic motor tuning unit, with complex mechanics.