Re: Anyone tried this yet?


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Posted by Matt Walters on August 12, 2000 at 16:43:34:

In Reply to: Anyone tried this yet? posted by Mark in Ohio on August 12, 2000 at 02:07:54:


Short leadpipes mean a more rapid taper ratio. That is what you are noticing. FIRST, the entry bore diameter of the valve section becomes a given once you decide which valve section to use. The fact that when such comparisons are made, it is often with the same mouthpiece receiver, that fact will then also create a SECOND given diameter. If you plot out the diameters and factor in the length of the leadpipe, a shorter pipe has to EXPAND QUICKER than a long leadpipe. But only if you are talking about using a single taper ratio.
Let's say your experiment is with a tuba with a long leadpipe and really short main tuning slide after the valve section. If you make a shorter leadpipe with a single, quicker, taper ratio greater than what was there originally, the response will be quicker but of course it will now play sharp. So, you will have to add CYLINDRICAL tubing to the main tuning slide area.
I can achieve the same results by leaving the tuning slide short, and making a custom leadpipe that will rapiidly expand to the valve section's diameter in the same length that you liked, then stay cylindrical the rest of the way to the valve section.
However, my custom leadpipe taper ratios are a little more sophisticated than that.
Thanks for asking a juicy question like that.
Matt


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