The levinson ML-9 is Class A/B and it was 100 watts per channel in 8 ohms. It is the same amp as the ML-3 which had 200 watts per channel. You are confused with the Levinson ML-2 which were mono 25 watts class A and were used with Quad speakers mostly at the time.
Does the power of an amplifier really matter?
Excuse my ignorance, but I am trying to understand the meaning of amplifier power. A doubling of amplifier output power results in a 3dB increase in sound-pressure level. So, if I listen to my stereo at a volume of say, 70 dB, what is the difference in a 100W amp vs. 250 W amp? If I listen at 70 dB, is more power delivered to the speakers with a 250W amp vs. 100W amp (resulting in better driver control)? I am not sure that is the case. Is it that a higher powered amp delivers a given amount of power more cleanly? Not sure if that is true as well. Can anyone educate me on this fundamental property of amplifiers?