Title: Power amplifier with distortion control

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Abstract: An electrical audio power amplifier is connected to receive an input informational signal from a pre-amplifying stage functioning with a transducer or pick-up device such as a magnetic phono cartridge or tape head and connected to supply a transformerless output to drive a speaker to create audio sound waves substantially free of distortion. An input differential amplifier includes a first input supplying the input informational signal and a second input supplying the output informational signal and providing a differential output signal to an output amplifying stage including a pair of intermediate amplifiers and a power amplifier to directly provide the output informational signal to the speaker. A second compensating differential amplifier includes a first input supplying the input informational signal and a second input having a variable tapped impedance such as a resistor supplying the output informational signal and providing a compensating output signal in response to sensed distortion which is summed with the differential output signal provided by the input differential amplifier to substantially eliminate distortion.


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