Will upgrading Umbilical cord power supply to preamp improve sonics


H, Is there any advantage to an higher quality umbilical cord. Cables everywhere else make improvements for me through out my system. I've never put much thought into this and don't even know where to buy or if they are even available and if so where? If anyone has done this upgrade was it a large improvement and not just subtle and what was cost per cable? Thanks

paulcreed
Thanks, I will contact the above cable company's, now I know where to go. I'm quessing like everything else copper,silver and quality of connectors determine sound.
Although they make good products I would be very cautious when dealing with Revelation Audio. Please do some research.

Dont forget the connectors as well. You havent mentioned what type of preamp you own. 
What are the issues with Revelation? I’ve only purchased their products used and have been very pleased 
I did read before my second post when vendors names were given Revelation audio has had some issues with not shipping items after funds exchanged. I'm going to avoid them if this is the case, don't know if it is true but just what I read online. I guess each vendor is going to have a flavor of its own. Now I'll just weed through that now. Just want neutral if these umbilical produce a signature sound.