FIELD: display equipment. SUBSTANCE: device has pulse-width modulation circuit for uniform voltage level which supplies primary circuit of beam return transformer independently from extra line frequency. Device for excitation of beam return transformer directly controls line frequency in lower band by halving line frequency in high band mode in order to provide possibility to use standard rectifying diodes even in high band mode. EFFECT: prevention of decreased efficiency of transformer caused by excessive line frequency. 6 cl, 4 dwg
