FIELD: erasure of magnetic records. SUBSTANCE: current is formed in winding of erasure head. The current is identical to form of voltage of high-frequency erasing generator. The operation is carried out by means of comparing instant values of voltages of high-frequency generator and current in winding; the current is corrected to reduce difference between these values. Winding of erasing head is embraced by feedback circuit of differential amplifier. Resistor has to be feedback signal detector; the resistor is connected with the winding in series. EFFECT: improved efficiency. 5 cl, 2 dwg
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