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Radio "ZK" from the second half of 1934 produced Moscow Radio Engineering Plant named after Krasin. Radio "ZK" is built by direct amplification according to the scheme 0-V-1 on 2 radio tubes with adjustable feedback. The radio receiver is designed to receive local and powerful long-range radio stations in the range from 200 to 2000 meters per loudspeaker. Battery power. The rated output power of the ULF is 50 mW. Sensitivity without feedback 20 mV, with feedback on the threshold of generation of about 1 mV. The range of reproducible sound frequencies is 250 ... 5000 Hz. The receiver without radio tubes was on sale. Its price is 219 rubles.