If you have lots of capacitors in a line stage, presumably tube, preamp are primarily for filtering the power supply. Without going to the trouble of looking up that CJ pre schematic, there shouldn't be more than two coupling caps per channel.....maybe just one. There's not much to a line stage pre.......
What's the value in lots of capacitors inside a line stage preamp?
On one system I am using a Conrad Johnson gat2, and it's loaded with Teflon capacitors and step attenuator volume control, vishay, and I'm sure lots of other lovely things going on. It's doing a great job.
But I have no idea how important all those capacitors are except that they store a lot of reserve power and are available to fulfill Power demands of musical changes. Maybe that's all I need to know.