Circuit for regulating the color subcarrier amplitude in a video recorder

A method of regulating the amplitude of a color subcarrier in a video recorder for recording and playing various forms of television signals by using overscanning of the visible portion of a television signal comprising the steps of:

• providing a first regulating voltage to adjust the amplitude of said color subcarrier to a value permitting rapid changes to said amplitude in response to head changes in said recorder by switching a regulation circuit to a first time constant during said overscanning;
• and
• providing a second regulating voltage to adjust the amplitude of said color subcarrier to a value which avoids flicker in the first visible line scanned in said visible portion by switching said regulation circuit to a second time constant, longer than said first time constant, before the first line of said visible portion of the television signal is scanned.