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Unregulated bias can also mean that the bias voltage is derived from an unregulated source. As the amp draws current this voltage supply swings up and down with current. This leads to a constantly changing bias voltage which causes the amp to operate somewhere between the different classes. It may be bad enouigh to swing all the way from class AB to class C. It is best to regulate the bias voltage before applying it too the amp.

[QUOTE="Captain Kilowatt, post: 559391, member: 39"] Unregulated bias can also mean that the bias voltage is derived from an unregulated source. As the amp draws current this voltage supply swings up and down with current. This leads to a constantly changing bias voltage which causes the amp to operate somewhere between the different classes. It may be bad enouigh to swing all the way from class AB to class C. It is best to regulate the bias voltage before applying it too the amp. [/QUOTE]

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