power amplifier through a conditioner

Power conditioners vary---as well as the quality of the power from your lines,does also.

As usual no easy answers here, only you can decide for yourself. Having said that I think you would find the consensus of knowledgable audiophiles is not to use a conditioner on power amps.
There was a time when I thought I preferred a conditoner in a previous system in which I had a low powered amp and only one dedicated circuit. Now that I have higher powered monoblocks and three dedicated lines I much prefer the amps directly out of the wall.
My experience with conditioning on amps is that none is too little, a power conditoner is too much, and a small amount is just right.
With no conditoning the sound is thin and the upper mids are a touch edgy. With too much the sound is opaque, dark, lacks dynamics and edge, sort of lifeless. With exactly the right amount the sound is nicely balanced.
The right amount will probably vary with your setup. For me it is simply Bybees in the amp running from the IEC to the power transformer on both hot and neutral along with good power cords. Caps on your ac receptacle are another good way to go.
In the end only listening will tell you which is best, IMHO.

Make sure your power conditioner is not current limiting!