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Since the beginning of 1938, the lamp network receiver SVD-9 has produced the Alexander Radio Plant No. 3 NKS. During the production of the SVD series of receivers, their electrical circuit changed, and the model name changed accordingly. Another modernization received the name '' SVD-9 ''. In 1940, the round scale of the receiver was replaced with an oval, and the electrical and wiring diagram was also partially modernized. The radio receiver "SVD-9" is assembled on 9 lamps of the types: 6K7, 6A8, 6H6, 6F5, 6L6, 5TS4, 6E5. Ranges DV (A) 750-2000 m, SV (B) 200-556 m, KV (D) 85.7-33.3 m, KV (D) 36.6-16.7 m. Receiver sensitivity is about 30 µV . The intermediate frequency is 445 kHz. The nominal output power of the receiver amplifier is 3, the maximum is 7 watts. The audio frequency range is 100 ... 4000 Hz. Power consumption from the network 100 watts. The dimensions of the receiver are 560x360x290 mm. Weight 16 kg. The receiver is assembled in a case of multilayer plywood and wood, coated with varnish. The round, later oval scale of the receiver is protected by glass. In the center of the scale is the emblem: the globe with a star, a sickle and a hammer, on the oval there is the logo of the Alexander radio plant. Above the scale is the setting indicator with a visor. Four control knobs. The first switch ranges (ABD), then the setting and volume. Lower tone control and power switch. Dual adjustment knob with gear. Loudspeaker "GME-1" with bias.