Having tube rolled integrated amps, phono stages, and amplifiers, I can say that tubes can make all the difference in terms of gain, clarity and other aspects. The tubes in your CJ pre will make the most difference. I replaced the stock 12ax7 tubes in my pre with GE 5751 tubes and it made an incredible difference in terms of clarity, gain, presence, and soundstage. Those tubes were $60 each, but it was an immeasurable investment.
But I also did my research in terms of what tubes were the most complementary to my unit beforehand.
But I also did my research in terms of what tubes were the most complementary to my unit beforehand.