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Since 1939, the Siberia detector radio receiver has been produced by the Novosibirsk plant No. 625. The radio receiver is similar to the Wave model. Until 1946, the receiver was released in a wooden case, and then in a carbolite. The radio is designed to receive local and powerful long-distance radio stations. The range of received waves in the receiver is from 300 to 2000 meters. The adjustment from wave to wave was made by a device of a rheostat type. The receiver had a volume control knob, which was also of a rheostat type and acted on the principle of reducing or increasing the loops of the loop from which the signal was recorded to the detector. The regulator was helpful when receiving local radio stations. When receiving less powerful and distant radio stations, the loss of sensitivity and selectivity introduced by this regulator was significant. The detector is removable, of any type with a constant operating point. With the receiver, it was recommended to use electromagnetic or, preferably, piezoelectric headphones. The dimensions of the receiver are approximately 130x100x80 mm. Weight in a wooden case 550 grams, from carbolite 780 gr. Photos from the forums: http://forum.odlr.ru/ and http://www.forum.oldradio.org.ua.
Based on information from collection of Valery Khartchenko