Power conditoner..

Carrlsbad2

That is a good Approximation, BUT

An Amp can ONLY produce  a relative output within and given operating range. If you have say low power you can not get something from nothing, that isn't there to begin with and you will have a comparatively weaker output. If your Bias voltage is off or your output supply voltage is Low/High, your output will change along similar lines. The circuit can TRY to compensate but there is no circuit that can demand an output. Even a constant current amp has it's limitations.
On the other hand your statement about PP is right on and that is a great place to lock in some stability and consistency.

You betcha I'm having a great day and haven't even turned on the music yet! 
Also I was not trying to imply that the changes would be drastic, but just there.
Also I have seen numerous places where the voltage can change anywhere from just under 100v to 130v. I had to call the pub utils just about 6 mo. ago for that particular high voltage and I know of one apt building in Colorado Springs that was having a cascade failure of Air Conditioning units and when they put a voltage recorder on the line they found it was due to something as ridiculous as 95v. Of course I do live in this backwoods outpost known as Denver!