Power Conditioners

Not sure if I placed it in the correct topic but here goes. I was just wondering how power conditioners work, as I want to buy one. There are conditioners with only filtered inputs and conditioners with some filtered inputs and some unfiltered. I believe the unfiltered ones are for analogue devices. But why should these go into the unfiltered part? If I buy a power conditioner for example with only filtered inputs, will I not be able to put my class A amp in? Or will it have a negative effect?
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+ 1 Rixthetrick for the Puritan conditioner 

Cakyo , LOL  , another guy that doesn't need actually hear said component in his system . Is there some Julian Hirsh fan club you belong too we aren’t hearing about ? I ask because there are a few members here on Audiogon that claim they don’t need to listen to said components to know how it performs.
If you don’t want to take that step to actually listen to a AC conditioner like a couple brands mentioned here or you have and you just can’t hear the effects of a lowered noise floor then try and get yourself a broadband AC power supply ripple analyzer , that would be a good start .
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I wonder if it’s measurable at all to measure the noise inside the device (amp or whatever). All everyone is talking about is the noice from the main outlet. That’s not even interesting as the amp itself does filtering itself too.