Line deflection circuit in a picture display device

A circuit for a line deflection in a picture display device, comprising the series arrangement of a controllable semiconductor element, a controllable bidirectional deflection switch and a supply inductance, which series arrangement is coupled between terminals of a supply voltage source, further comprising a deflection resonant network including a line deflection coil which network is arranged parallel to the deflection switch, a first drive stage for applying a first drive signal to the semiconductor element for controlling energy stored in the inductance with a feedback control in dependence upon an amplitude of a generated line deflection current flowing through the line deflection coil for maintaining the said amplitude constant, and with a forward control in dependence upon a field frequency signal for obtaining a field frequency variation of the amplitude of the line deflection current and a second drive stage for applying a second drive signal to the deflection switch for line frequency rendering this switch alternately conducting, namely during a trace time of the line deflection current, and non-conducting, namely during a retrace time of the said current, characterized in that the feedback control is active at the field frequency during a time interval which is not longer than approximately a duration of one field retrace.