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The radio constructor "Delta SDP-2" was produced since 1989 by the Berdyansk factory "Tide". The radio constructor makes it possible to equip a reel-to-reel or cassette tape recorder with a system of dynamic adaptive biasing, which expands the recording and playback band by 2 ... 3 KHz towards high frequencies and reduces nonlinear distortions by 1%. A more detailed description with diagrams in the instructions for the assembly and operation of the radio constructor "Delta SDP-2".