To tomcy6. Thank you for comments and advice. They make good sense.
Yes, I would evaluate the sound quality before doing any tube rolling. I did this when changing the two stock tubes to Mulllards in my Rogue Sphinx integrated which is currently being used as a pre-amp.
On the other hand, I never was a big fan of tube rolling because of its expense, and complexity of finding the right tube. Fortunately, SHOULD I decide to go with the Cary SPL-03, I have a good and knowledgeable audio dealer near of L..A...... Upscale Audio.
To audio connection, Thanks for the reply about the ARC SP16.
BTW, I am not sure the seller identified the pre-amp correctly, listing the piece as a SP16i, not a SP16