Only for owners of ARC SP 16

I have just acquired an ARC SP 16 as replacement for an ancient ARC LS2B.The rest of the system comprises a Bryston 14 BST,Arcam FMJ CD 23 and B&W CDM 9NT speakers.
My query is whether any SP 16 owners have experienced any audible improvements after replacing the factory supplied power chord. I should add that the SP 16 is barely a few days old and is a long way away from being broken in.
After a couple of days, I replaced the factory supplied power chord with a $350 Transparent Superlink power chord I had used extensively with one of my earlier preamps the Bryston BP 25. Now wonder of wonders, the system sounds much better with the factory power chord. There is greater transparency and detail which is ever so slightly masked with the Transparent chord. Has anyone experienced anything similar?
Overall, this may sound a wee bit premature but the SP 16 is a brilliant preamp.Straight out of the box it has brought a certain ethereal quality to the music whether Norah Jones or Pink Floyd.
Many thanks for your patience and time.
Njoy.
Sunnyboy