It depends upon how the amp is biased.
A class-A biased amp runs full throttle at all times. A good example is the VAC Renaissance series amps. Generally speaking, more thermally efficient designs (class AB) idle at much lower wattage and increase electricity draw when the volume is turned up.
You will know if you have a Class A amp, as this design feature is usually trumpeted by the manufacturer for its allegedly superior sound (and will makes its presence known when you get your electricity bill).
Hope this helps.
A class-A biased amp runs full throttle at all times. A good example is the VAC Renaissance series amps. Generally speaking, more thermally efficient designs (class AB) idle at much lower wattage and increase electricity draw when the volume is turned up.
You will know if you have a Class A amp, as this design feature is usually trumpeted by the manufacturer for its allegedly superior sound (and will makes its presence known when you get your electricity bill).
Hope this helps.