Network tube radio receiver `` DLS-2 ''.

Tube radios.DomesticSince 1929, the DLS-2 network tube radio receiver has been produced by the Ordzhonikidze Moscow Plant. The DLS-2 radio receiver (Detector Lamp, Network 2-lamp) is designed to receive local broadcasting stations on a loudspeaker. The operating wavelength range is from 225 to 2000 m. The signals of radio stations are detected by a crystal detector and then amplified by two low-frequency stages on transformers. Coarse tuning of the wave is made by switching the coil turns in the antenna circuit and the coil turns of the resonant circuit, inductively coupled to the antenna coil using a common, double slide switch. Fine tuning to the station wave is performed by a variable capacitor included in the circuit. Using a special switch, the connection of the resonant circuit with the detector circuit is regulated. Reception is made to an external antenna or lighting network connected to the antenna coil using a jumper. The low frequency amplifier is designed to work with UO-3 lamps, but can work with UB-132. The loudspeaker is connected to the anode circuit of the lamp of the second stage. Anode voltage and bias are supplied to the lamps from a full-wave rectifier with a filter, operating with a VT-14 (K-2-T), VO-125 or VO-202 lamp, assembled in one box. The incandescence of the lamps is powered by a special winding of the power transformer of the rectifier. The rectifier transformer is designed to operate on a 120 volt AC mains supply.