The signal from a pre-amplifier or tuner is supplied to the input terminals of the power amplifier by means of a voltage-dividing network, the element is parallel to these input terminals being a photo-sensitive resistor of new design. Facing this photo-resistor in a lightproof enclosure is a neon lamp connected to the output voltage of the amplifier. Because a neon lamp ignites at a fixed voltage, the value of the photo-resistor resistance will be decreased as soon as this voltage is reached. Consequently the input signal to the amplifier will be decreased as well, making overload substantially impossible.
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