Transistor power amplifiers in limited space are controlled by allowable heat dissipation. In typical class -B- amplifiers, theoretical efficiency can be as high as 78%. Maximum heat dissipation within the transistor occurs theoretically at 40% maximum power output, at which point the efficiency drops to 50%. : If the voltage at low power output can be reduced in accordance with demand, the amplifier could be operated continuously at peak efficiency. Means can be provided to vary the supply voltage in proportion to the output voltage required. Test results, using groups of listeners, show that it is possible to achieve excellent results without detectable distortion.
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