I recently sold my refurbished (as good as new) KSA-250 power amp to a local audiophile. He replaced the original stock power cable with a $1,000 after market power cable (can't remember the name, I will find out if this is important to you) and guess what? Absolutely no difference in sound quality! I suspect this is one of the reasons Krell do not recommend after market power cables are used with their products. My advise for what it is worth; either contact Krell and buy an original power cable from them or buy a standard IEC power cable on eBay.
20amp Power Cord for $18
My old KSA-250 came without its 20 amp power cord - as as I'm sure you know even a "cheap" such audiophile cord will set you back $300 and some thousands. Was considering hard wiring but also I set out on search for a good quality but unshielded good one. It was difficult but finally found one on amazon for under $18 (5-20P to C13 Power Cord, 6 Foot, 20A, 125V, 12/3 SJT - from Iron Box).
Just FYI if you are skeptical about cords for the 1% like I am.
Just FYI if you are skeptical about cords for the 1% like I am.