An excellent umbilical power cable is produced by Revelation Audio Labs. Their CryoSilver Reference umbilical power cable is a remarkable upgrade over the mediocre stock umbilicals. I have the 1-meter length, paid $299, it is the best money I ever spent in audio.
Cary SLP-05 Umbilical cord
I heard that someone makes a upgaded cord to go between the power supply and the preamp section, any body know who?