If custom power cords really sounded all that much better, wouldn’t high-end manufacturers put them on their equipment?
EMM Labs components are shipped with Kimber power cables. There are other high end manufacturers that include upgraded power cords.
However, in general manufacturers supply a basic power cord so that you can be up and running in minutes, as well as to keep the overall cost down and leave s power cable choice to you. Same with tubes. All tube equipment comes with new production tubes. It’s up to the individual who buys this equipment to use stock or upgrade to pricey NOS tubes.
Kimber runs specials on eBay, with 30 days return policy. Here’s a 2m PK14 Ascent for $319 https://ebay.us/m/UOJhwy
That’s the model power cable I use on the Meitner.

