Radiomanjh: I just researched this type of break in process and was told by my interconnect manufacturer that the power amplifer is not needed for for break in to occur. You can run them from any source (even a VCR) into a preamp and this will allow the signal to complete its course. The preamp selector does not even have to be placed on the "break in" source and you can listen to another source, if you have two sources, during the break in process. It works, I ran a pair of silver interconnects in for over 200 hours without having to listen to them. Though if you are curious like myself you will take a peak/listen at them every now and then. I ran them on a cable music station for part of the time (from the VCR) and finished off running from them from our second "mini" system into our main systems preamp. Good luck.
