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The Tube Radio Riga T-689, a networked radio receiver, was produced in 1946 by the Riga Radiotekhnika plant from 1946. '' Riga T-689 '' is a 9-type superheterodyne desktop-type radio receiver designed to receive broadcasting stations and play back recordings from an external adapter, powered by 110, 127 and 220 volts AC. The base radio may have been the "Telefunken D-860WK" receiver. The abbreviation '' T-689 '' stands for: T - network, 6 - 1946 edition, 8 - the number of simultaneously operating tuned RF and IF circuits, 9 - the total number of radio tubes. In addition to long, medium and short waves, the receiver has two stretched HF subbands of 16 and 19 meters. The radio used optical indicator settings. In addition to manual volume control, automatic gain control is also applied in the HF stages. The receiver has a four-stage tone control for high frequencies. The sensitivity of the receiver is approximately 100 µV. The adjacent channel selectivity is about 50 dB. The maximum output power is 5 W with a distortion factor of 10%. Band of reproducible sound frequencies 45 ... 4000 Hz. In the radio applied loudspeaker with enhanced acoustic characteristics. The power consumed by the receiver from the mains is 105 watts. Dimensions of the receiver 585x415x315 mm. Weight 25 kg. The electrical circuits of the receivers of different years of release, and the receiver was produced until 1952, had minor differences.