For what it's worth, I sold a pair of CJ Premier 12 monoblocks after a friend brought over a pair of SET amps (845 output tubes) he had built, to compare against the CJs. He built me a pair and I still have them, after 10 years.
On the other hand, I did like the CJ Premier 17LS2 (the "2" is vital) and kept it until I felt the need for polarity-switching and replaced it with an Aesthetix Calypso. The 17LS2 and CT-5 sounded exactly the same to me, in my system.
IMO, if you switch from SET to push-pull tubes, you'll surely hear the difference right away and it may not be a pleasant experience.
On the other hand, I did like the CJ Premier 17LS2 (the "2" is vital) and kept it until I felt the need for polarity-switching and replaced it with an Aesthetix Calypso. The 17LS2 and CT-5 sounded exactly the same to me, in my system.
IMO, if you switch from SET to push-pull tubes, you'll surely hear the difference right away and it may not be a pleasant experience.