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The quadrophone tuner Polonaise-Quadro was developed in 1975 by the Sevastopol Radio Plant named after V.D. Kalmykov.
The tuner is designed to receive experimental quad transmissions.
The newly developed tuner "Laspi-001-stereo" of the same factory was taken as the basis of the design, a compatible (with stereo reception) quad-band decoder was added, and the indication circuit of the type of signal reception was changed.