Audio Research Ref. 210 questions

just got these today and was wondering about a couple things. Has anyone tried power cables other than stock? I was told by the seller that the stock cables were the best. The cables don't look like anything special to me ;) I was also wondering about footers etc.. Do any make a difference with these amps? I have them on the Adona Nemesis amps stands. Any replacement fan options - I find the too loud... How about the 6n1p tubes - anyone replace them?? Thanks for any and all info.