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The radio receiver network lamp "9N-4" possibly since 1937 produced the Voronezh plant "Electrosignal". The "9H-4" is a 9-tube Desktop Receiver of the 4th design. For its development of the model, the technical documentation of the company "RCA" (USA) was used. The receiver used radio tubes: 6K7, 6L7, 6Zh7, 6H6, 6F5, 6F6, 6E5, 5TS4S. In a significant series of radios produced, foreign analogue lamps were used. The ranges of radio waves: DV 715 ... 2000 m (X), NE 175 ... 575 m (A), intermediate waves 46 ... 170 m (V) and KV 13.5 ... 48 m (C). The sensitivity of the receiver with a good outdoor antenna on all ranges of about 50 µV. The adjacent channel selectivity is 46 dB. Output power 2 watts. Band of reproducible sound frequencies of 80 ... 6000 Hz. 75 watts mains power consumption. Case dimensions 580x310x420 mm. The weight of the device is 26 kg. On the front of the radio there are 5 knobs. On the left, there is a "music-speech" switch combined with a network switch, then a volume, a dual tuning knob for frequency with a vernier, then a band selector and a treble tone control. The radio is enclosed in a wooden case. For each range there is a separate scale, calibrated in KHz and MHz, alternating when switching ranges and visible through the notch in the metal frame. On the bottom scale graduated at UE, you can easily remember the setting for an interesting radio station. The tuning indicator is made on a 6E5 lamp.