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Topics - 350 Rocket

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All about Clarinets / Conn bore question
« on: November 05, 2017, 06:29:53 PM »
There's something I've long wondered about Conn clarinets. I have three Conn student models (1958 composite 14N or 50N, 1961 wood 18N, and a 1964 16N) and all three have a bore diameter of .605" at the top of the upper joint and .590" at the bottom. However, while the barrels are .590" at the top they're no more than .585" at the bottom. When assembled there is a visible "step" in the bore where the barrel meets the upper joint. The 16N's barrel is definitely original, the other two can't be positively confirmed but the socket rings match.

What is this considered? Reverse taper? Polycylindrical? What's the reason for an immediate .020" or so difference where the barrel and upper joint meet?

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