If you have your amplifier plugged in to IsoTek start with trying the amp plugged into the wall directly. Keep the isotek for source components only. I would even plug the ARC preamp directly into the wall as well. Try it.
If you insist on using power conditioner I’d give Shunyata a try. Bypass puritan. Not good at all. TOL Audioquest is worth trying as well. But again the amp and preamp most likely don’t need power conditioning. Especially if on dedicated circuit.
