Power amp protection and filtering

I apologize if this has been asked before but I have never heard the answer.

I have a PS Audio power regenerator. I have the pre, phono amp, turntable, cd player, Reel to reel, and tuner plugged into it but I have been told power amps don't need and, in fact, shouldn't use such filtration. I have an Audio Research VT200 and I know this PS Audio product wouldn't be big enough for the amp any way but would a separate regenerator be advised for such an amp? If not... why not?

I had called Audio Research and they were fairly non-committal on the idea.

Thanks in advance for any light you can shed on this.