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I have a few questions about the valve bore of the Rudolf Meinl horns. What is the bore size of the current Rudy C50, and C45?(5/4 CC and 4/4 CC respectively) I also read that the valve bore used to be larger? But was switched sometime in the 80's? THose that have played, or owned both, what effect, if any has it had on the sound and response of the instrument? Any info you would have is much appreciated. I am considering purchasing one of the two.

While we're at it, how about the 43 and the 4345, as well, please!

Adam,
What year was your Rudy 5/4 made?

Pretty sure the 3/4 CC is .728"

ballpark, not sure of exact numbers:

43 .730
45 .770
50 .866
4345 .730
4345p .715