Plug Amp directly to Mains or use a Power Conditioner?

Taken from the '10 Biggest Lies In Audio'

Just about all that needs to be said on this subject has been said by Bryston in their owner's manuals: "All Bryston amplifiers contain high-quality, dedicated circuitry in the power supplies to reject RF, line spikes and other power-line problems. Bryston power amplifiers do not require specialized power line conditioners. Plug the amplifier directly into its own wall socket."

What they don't say is that the same is true, more or less, of all well-designed amplifiers. They may not all be the Brystons' equal in regulation and PSRR, but if they are any good they can be plugged directly into a wall socket. If you can afford a fancy power conditioner you can also afford a well-designed amplifier, in which case you don't need the fancy power conditioner. It will do absolutely nothing for you.

@motown-l 

I left off some details about my question. I have read in various publications that an amp has internal voltage regulation that could be adversely effected by external power conditioning.

did they mention what amps by chance ?

what amp are you using ?

When I bought my now 70 YO house, some 26+ years ago I had a 20 amp dedicated line run from my elec panel directly to the 4 plug outlet for my system. I ran it outside, digging a several foot deep trench

@carlsbad I had a PSA Premier Power Plant plugged into my dedicated line. It really did NOT improve the sound. Lots of PLCs in between, I have a Core Power 1800, which DOES

There was a post to this thread that was deleted and it hd a link to something sort of like "the dangers lurking behind your walls" or something like that) & it was about old &/or bad wiring. This got me to thinking, as like the OP of this thread, I own a house built in the ’60s and when I bought it it did have the old style fuse box and there is one circuit with a few outlets WITHOUT the 3rd wire (ground). Is there a good chance there is some knob & spool going on here, and would I be able to see that by pulling one of those outlets and would I be able to identify it from what wire I could see from the removed outlet?

OOPS!  On edit:  wrong thread.  But I'll leave the question up anyway.