Hello RLawry,
I found that going from Hovland MGII up to CT-1 between my tonearm and phono-pre was a huge improvement, and going from CT-1 to CT-1E was also a big jump, but not as big as going from Hovland to CT-1. I would imagine going from CT-1 to CT-1U would be a very noticeable improvement.
As posted earlier, when I went from CT-1E to CT-1U between Phono-pre and pre the improvement was much bigger than I thought possible. If I had the money, I would make the upgrade, but I'm awaiting my CT-1 speaker cables to finally make my whole system HF, so that's where my upgrade budget went (along with more LPs).
JA