Power cord break-in tips?


I will receive a new power cord for my VAC in a few weeks. In my experience some power cords improve sound quality and over time and a new power cords effect will change in a good way, hopefully. 
My question is what appliance do you folks use to break-in a new cord? I use our plasma TV it's used much of the day.

128x128mid40sguy
I agree with Dave.   If you're interested, make notes as to the different results from minute to minute.
VAC 160i, Modwright Oppo 105, Garrard 301 Bob's devices step up, Harbeth HL5+.
RCA's Purist, speaker cables Auditorium. Power cables Purist and Acrolink.
The new cable arrived today it will not fit my TV. I connected it to a PC that runs 24-7. I'll hook the new PC to the VAC Saturday it should have about 70+ hours on it then.
Thanks for all the suggestions folks!