Just browsing this thread and not an owner of the Riviera but with (too much?!) experience of Shunyata PC. There is a big difference between v1 and v2 because they moved away from pure copper for the v2:sThank you for this, very useful. I'll try to see if I can get either of these two cables at least for the Power Plant and the Riviera. Would you recommend I also use them for the rest of my gear? Or can I get away with cheaper cables like the Puritan Ultimates for my DAC, switch, clock etc?
One cord from the v1 series that IMHO works very well with tube amps is the Sigma. In comparison with the v2 it’s actually also ”slightly warmer and more bloomy”. Good luck!