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The radio battery-type "SG-8" from 1927 produced the Trust of the Weak Current Plants. "SG-8" - Super heterodyne 8-tube designed for long-range and directional reception of broadcasting stations on an external loop antenna. The receiver's wavelength range 300 ... 1800 meters is divided into three subranges. Tuning the receiver is difficult, but with fine tuning, high sensitivity and selectivity are realized. Reception is carried out on headphones.