Side pincushion distortion correction circuitry

Claim 1

In side pincushion distortion correction circuitry for a colour television receiving set which comprises a first saturable reactor having an input winding connected to a vertical deflection circuit and an output winding having its inductance varied with a drive current synchronizing with a vertical deflection current signal running through said input winding, said output winding being connected in series with a horizontal deflection coil attached to a horizontal output transformer included in a horizontal deflection output circuit so as to generate also horizontal flyback pulses, the improvement comprising: a second saturable reactor provided with an input winding connected to the vertical deflection circuit and an output winding connected equivalently in parallel with the horizontal deflection coil such that the inductance of said output winding of said second saturable reactor is varied with drive current synchronizing with a vertical deflection current signal introduced through said input winding of said second saturable sector; and means for supplying said drive current to the second saturable reactor such that the inductance of the output winding of the second saturable reactor varies in the opposite direction to the inductance variation of the output winding of the first saturable reactor to maintain the composite inductance of said reactors substantially constant, whereby the horizontal flyback pulses are substantially unchanged in amplitude and pulse width regardless of the inductance variation of the first saturable reactor.