Plugging Amp into Power Conditioner???

Dovjm,
As others have stated it depends on the design and quaility of the particular conditioner.I have 20 amp dedicated lines and my various tube amps sound good plugged into the wall. However the sound improves quite a lot when plugged into my BPT3.5 Signature Plus conditioner(uses a large high quaility/high current balanced transformer). Every sonic parameter is better with no down side. The noise floor is lowered with exceptional dynamics,inner detail, sense of ease and relaxation and an enhanced realism and live presence.
The blanket statement that power amps are ALWAYS better directly plugged in the wall outlet is a tired cliche.

I agree with Charles 1,as I use dedicated lines also, but use
Torus balanced PUI's.
They do make a HUGE difference and it's all good.
That wall can only give you 15-20a and some non current limiting conditioners don't limit current,they do,because
that's all the wall can give,so they are limited.
Having gobs of reserve power for the amps makes a huge difference.

For the past 6 years I have used my own tweaked out DIY balanced power conditioners, plugged into a dedicated 20A line. My latest implementation employs separate balanced isolation transformers for amp, preamp, and digital source. My experience has been similar to Charles1dad's, except that I would add increased low end weight and authority to the list of improvements.

http://img.villagephotos.com/p/2003-5/191557/B2_09.jpg

http://img.villagephotos.com/p/2003-5/191557/B2_08.jpg

http://img.villagephotos.com/p/2003-5/191557/b_08.jpg

That's another good description"Authoritive"
If these other transformers do what the Torus does,
then personally, people should at least audition or compare
these to other conditioners and they will be able to hear the
huge difference they make.
As some say,once she's at your home,she probably won't be going back.
Major difference musically with huge dynamics,
One of my major upgrades for sure as they did so much for the music and that's what it's all about.

I don't dare plug an amp into the wall where I live, where there can be sudden powerful thunderstorms. About a month ago, the Monster surge protector I plug into took a big surge, and I quickly got up and turned everything off. Later, I turned everything on again and all was well for a few weeks. Then suddenly, the Monster unit just up and died one me about a week ago, some sort of weird delayed reaction I guess. I have been told that this sometimes happens (that a unit keeps working a few weeks after a spike), but it's the first time I have experienced it. It certainly did it's job, I guess. But it also confirmed that I will NEVER plug an amp directly into the wall.