I think selmer CT was a pro model dating back before selmer had those 9 & 10 series out there and a little different than the Balanced Tone. And Jbutler says that the 9* was selmer's clarinet with the purpose to compete with the R-13. But lots of people love 'em! Here's a thread or two on what I found with a quick search. Jbutler seems to know a lot about them and his opinions are well respected on this board.