When a pulsed transient signal is input, due to the presence of capacitance in the circuit (such as hysteresis compensation capacitor, tube inter-electrode capacitance, etc.), the output terminal cannot immediately obtain the desired output voltage, so that the input stage cannot be obtained in time. Due to the negative feedback, the amplifier is in an open loop state at this moment, causing the input stage to be instantaneously overloaded. At this time, the input voltage is several times higher than normal, resulting in severe clipping of the input stage instantaneously. Wave distortion is called transient intermodulation distortion. It is essentially a transient overload phenomenon.
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