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Since 1951, the radio network receiver "ARZ-51" has produced the Alexander Radio Plant. The radio ARZ-51 replaced the model ARZ-49. The main differences from the previous model are noted in replacing the output stage lamp by 6П6С and simplifying some circuit elements. The power supply circuit has changed to full-wave with the 6TC5S kenotron. In appearance, dimensions and mass, the receiver hardly differed from the previous one. The operating frequency ranges are: DV 150 ... 415 kHz, CB 520 ... 1600 kHz. Intermediate frequency 110 kHz. The sensitivity of the model is about 300 µV. Sensitivity from pickup sockets is 0.25 V. The adjacent channel selectivity with 10 kHz detuning is at least 20 dB. 15dB mirror channel selectivity. The range of reproducible sound frequencies is no longer 200 ... 3000 Hz. The output power of the new 1GD-1 loudspeaker at SOI 10% is about 0.5 watts. The power consumption of 40 watts from the network.