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The radio battery "TL-3" from 1927 produced the factory MEMZA. "TL-3" is a three-lamp regenerative radio receiver assembled according to the 1-V-1 scheme. Mounted receiver in an oak box. The oscillatory circuits of the apparatus consist of three replaceable cellular coils and two alternating air capacitors. Feedback is governed by the movement of the coils. The three-roll holder is equipped with worm screws. With the attached set of coils, the wavelength range is 300 ... 1800 meters (on the surface is 250 ... 1850). The receiver has a relatively high sensitivity and selectivity. When comparing it has the parameters of the receiver "BT". The price is 77 rubles 74 kopecks.