Should Amps be plugged into a power conditioner?

Going on 25 or 30 years ago, a dealer in Philly sold me on these power conditioners he carried (a brand I've never hear of since).  He was skilled at selling me on stuff, and he swore up and down that ALL my eqipment should be plugged into it and (I paraphrase) it would make the background blacker, soundstage deeper, and just about every other good thing you could do to a sonic presentation.

Anyway, after I bought it I called Cary Audio up to see how they felt about me plugging my amp into it (this was back when they still provided telephone tech support), and the gentleman I spoke to sort of gave me the impression that he was not all that crazy about the idea.  I have used that power conditioner off and on, but I don't plug amps into it.

@atmasphere 

Current limiting starts at the power cord. Any time you have a glorified power strip, like so many so-called 'power conditioners' seen marketed to the high end audio community, the power cord it uses will have a voltage drop.

is a strip acceptable for all but the amp, or are you saying that everything should plug directly into the wall?

I use a power strip in my system but the amps are not plugged into it- they run off of AC lines of which they are the sole user. My preamp is pretty heavily regulated so it tends to be immune to power cords and the like and the rest of the system hardly draws any current, so it works pretty well.

@atmasphere , thank you; as always you provide helpful input. I posted a question on powerstrips a year or two ago, and I will spare you the entire story (because you would get bored and stop reading in short order) but I ran three dedicated lines into my listening room quite some time ago,

and then

I read some posts that made me question what I had done. First there was a thread about dedicated power lines which attracted several replies and also seemed to generate a few other threads on the subject, and although there was not exactly a universal agreement on the subject (surprise!) the take away I kind of got was that one dedicated line would be preferrable to multiple dedicated lines due to the interaction of grounds and neutral wires on the neutral bar. And not only that, I did not route my three dedicated lines in the wall with a lot of space between them, so I guess if rf is the reason for dedicated lines, I’d say that I didn’t achieve anything by that.

Therefore I put all my gear (CDP, pre, amp, sub) on one duplex. In order to do that, I used my glorified power strip for the CDP and the pre and I plugged my amp and sub into a 3 into one adapter/plug that I plugged straight into the wall.

I guess my other option is to connect the duplex that I am using to another duplex (in a series, if I am using the term corr4ectly?) which would give me two more outlets (on one dedicated line) and I would no longer have to use the glorified strip and the 3 into 1 adapter plug. I have kind of been holding off on that because where I have the 3 gang outlet box for my system is not the most comfortable place for me to work.

I've done both--plugged them into the wall and conditioners.

@bluorion  , do you hear a difference?

The main reason I don't think amps should ever be plugged into a power conditioner is that I enjoy having them repaired after lightning strikes.

@erik_squires  , are you making a case for surge protection or for power conditioners?