Why manufactures don´t burn in their amps and ...

Ralph;are there any cords that work better with your amps
that you like as a preference;you already gave me great advice on the Mogami balanced cables so I thought I would ask on the cords.

I would think most manufacturers have some type of a QA process where the product is burned in for x number of hours to weed out infant failures that occur.
Some may even have enviromental chambers that control temp,humidity,and vibration that affect the product.
Power cords buring in may have some type of merit but I don't know what the audible improvement would be.

Rodman99999- I did purchase a set of kimber power cords don't remember the model but it does not have a network on the cable and will be installing them on pair of audio valve challenger 180 monos I just picked up on Audiogon and am looking forward to hear their performance vs the signal cable cords I had before.
Do you think it is worth putting a high quality ac cord on my soundlab m2's backplate?; Let me hear your point of view.

I think that's a great idea I think I will use the signal cables first and then try the kimbers next;thanks