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Since 1930, SK-P4, SK-P5, SK-S, and SK-7 radios have been produced by Standart-Radio. The SK-R4 radio receiver is a 4-tube superheterodyne with one high frequency cascade, two stages of amplification at an intermediate frequency and a detector, operating in the range of 200 ... 2000 meters and receiving radio broadcasting stations to the frame antenna. The SK-P5 radio receiver is assembled on 5 lamps, repeats the SK-P4 radio receiver circuit, but has three stages of amplification at an intermediate frequency. The SK-S radio receiver has six lamps as well as the SK-P4 receiver circuit but has one cask d amplification at low frequency and can operate on a loudspeaker with medium loudness. The SK-7 radio repeats the SK-S receiver circuit, but has two low-frequency amplification stages, providing a loudspeaker reception on the loudspeaker. Unfortunately, there are no drawings or photographs described radio receivers!