Should I upgrade power cord for my preamp?

Hi Chris I trade my Cary Audio SLP-05 for the ARC LS27 and so far very happy with my decision. I mate my preamp with ARC DS-450 Power amp, this combo work magic. If you have any questions please send me a note and I will give you more details about ARC products. Tango.

Power cord can make a difference with digital sources and pre-amp as well but for different reasons. Power amp is mostly about current delivery ability. Pre-amp is more about more control of noise. Results can be better clarity, resolution, detail, soundstage and imaging.

I agree with Map, the most important thing with a pre is isolation and draining away noise with cones.Rubber products do not work, Mapleshade cones work well,but
the new Nordost 70$ each metal iso cones are fantastic.

Under a tube pre I consider the Nordosts essential.
Biggest advance I've heard in many years.

How about power cord upgrades for a Herron VTPH-2 phono preamp?

If it is a tube preamp, I would recommend a ribbon cord like Electrglide, Elrod, etc. I use a standard Electraglide on my Joule Electra and the difference is not subtle.