Quadrophonic tuner `` Polonaise-Quadro ''.
Radiols and receivers p / p stationary.DomesticQuadrophonic tuner "Polonez-Quadro" was developed in 1975 by the Sevastopol Kalmykov Radio Plant. The tuner is designed to receive experimental quadraphonic transmissions. The design was based on the recently developed Laspi-001-stereo tuner of the same factory, a compatible (with stereo reception) quadraphonic decoder was added, and the signal reception type indication circuits were changed.