•the presence of DC (direct current) at the output
•either
•unsafe operating temperatures in any of several critical areas within the amplifier
•sustained output current in excess of 80 amperes (which would occur only in the event of a dead short across the outputs).
If any of these fault conditions is sensed while the amplifier is in either standby or fully on, the amplifier will shut down completely (off mode, not merely standby). Moreover, it will not turn on again until the fault condition is corrected.
In addition, the AC input to each transformer is fused to protect against excessive current conditions such as driving shorted outputs.
Finally, the Nº33 incorporates a controlled clipping circuit that prevents the output devices from saturating. The harsh high frequency harmonics generated by hard- clipped output devices are avoided by the waveshaping action of this controlled clip circuitry.
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