Should I upgrade power cord for my preamp?

Thank you all for the insight. I should have said up front that my preamp is a c2300 by Mcintosh, which I believe has some condition device built in.

Shielding is important. Thanks again.

For pre-amp and source devices, especially digital,its all about noise control/reduction.

For power amps, its more about current delivery.

I use Pangea ac14se on both my ARC sp16 pre-amp and mhdt Constantine DAC at present. Each seemed to make things better, which I woudl attribute mainly to the shielded design of this model specifically for line level applications.

My Pass preamp is the only component I do not use an upgraded power cord on. Amp and preamp plugged directly into wall. Upgrade power cords on everything else.

Absolutely...power cords are the best way to upgrade your system.

I was a skeptic until I tried a PS Audio Premiere Power Plant. It made a huge improvement, so I decided to replace all my power cords with PS Audio cables. I used AC-10s for my amps and the PPP, AC-5s for everything else. It made more improvement than any interconnects, and I had dedicated 20 amp lines to start. They did take a while to break in, but both my wife and I heard a sudden step-up one evening. I wrote the company and asked if they ever got mail like that, and we were not the first to experience it. The Cable Company will let you borrow cords, and I expect you will hear clear differences, too.