My Jeff Rowland 301 mono amps sound a lot better when getting their power from a Burmester AC conditioner (but that is not the case with several other conditioners I have tried)
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.
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