+1 @lak
Every home is different with regards to noise levels in their lines, and every power conditioner is different. There will be a few factors that will influence whether a power conditioner will be suitable for an amplifier (or any component for that matter):
1. What type of filtering does it employ and how does it shape sound?
2. Does it limit current as a result?
Most power conditioners do enforce some type of current limitations, so if you have a power hungry amplifier, (depending on the conditioner) it sometimes cannot get the headroom it needs at peak current needs and as a result won’t be as dynamic as it should be. Sometimes the filtering also has inverse effects on the dynamics and details as well.
To date I’ve liked PS Audio power plants for everything except amplifiers. Even with their highest end P20 I still know a number of people who prefer to plug their amps into the wall. I personally own a Synergistic Research Galileo PowerCell, and I cannot tell the difference between plugging the amp straight into wall vs into the PowerCell, so I leave it in the PowerCell.