Battery radio receiver `` TL-4 ''.
Radio and electrical constructors, sets.Radio receiving devicesThe battery radio "TL-4" has been produced by the MEMZA and Moselectric factories since 1928. Three-lamp regenerative receiver "TL-4" is assembled according to the 0-V-2 scheme. The range of received waves is 350 ... 1700 meters. Mounted in a wooden box in the form of a remote control (inclined control panel). Tuning to the wave is performed by a sectioned self-induction coil and a variable capacitor. The feedback is regulated by rotating the feedback coil; two low frequency amplification stages operate on transformers. The receiver has low sensitivity and selectivity. Simple enough to operate. Provides loudspeaker reception (on loudspeakers such as "Record", "Bozhko", "Profradio") of local stations, as well as reception of powerful stations at a distance of 1000 or more kilometers in the absence of large interference. Receiver price 71 rubles. 21 kopecks A kit for self-assembly was also produced at a price of 62 rubles. 21 kopecks