Tube rolling is an option. It might work on Macs, but not too much on ARC and Shindo. Tube rolling is like trying different cables and I am a little tired of changing cables.Isn't changing preamps the same as changing cables? Each has their own sonic characteristics.
Yxlei (Threads | Answers | This Thread)
My brother has a Mcintosh C2200 and with stock tubes, it was muffled, veiled, lacking dynamics ... HORRIBLE! After he replaced the cheapo Chinese tubes with Telefunken ribbed plates, we can't believe it was the same animal. Sound was open, dynamic, transparent ...