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Re: Register Tube, Bore Intrusion?

Author: David Spiegelthal ★2017
Date: 2007-05-16 21:16

Interesting question, Don. I've done some experimentation with register tubes (mainly on alto and bass clarinets) and, in my experience, the amount of intrusion into the bore of the tube has had no effect on the acoustic response of the instrument (so long as it is flush with the inner bore at a minimum -- otherwise the bored hole for the tube adds to its effective length). Of course the size, shape, and placement of the tube have a huge influence on how the instrument plays -- no surprise there. As long as the register vent intrudes sufficiently to impede the flow of moisture from running off the clarinet bore into the register tube, it doesn't seem to matter how much farther the tube projects --- in my limited experience.

I've often set the amount of intrusion of the tube to whatever value simplifies the regulation of the register vent mechanism that covers the outer end of the tube, with no concern for acoustic effects (since I haven't seen any).

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