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using general-purpose tubes are biased negatively to the projected plate current cutoff point. Class B vacuum tube amplifiers are usually operated with grid current (class B₂). The bias voltage source must have low resistance and be able to supply the grid current. When tubes designed for class B are employed, the bias can be as little as zero.
* Class C amplifiers are biased negatively at a point well beyond plate current cutoff. Grid current occurs during significantly less than 180

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