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Author: Don Berger
Date: 2007-05-16 17:24

While re-studying the various patented keying structures {Mazzeo, McIntyre, Leblanc, Stubbins and others [less commercialized]} as related to several papers to be given at the upcoming Edinburg [Scotland] Conference [sure would like to attend !], I noticed, in some pats [drawings], some differences as to the lengths of the tubes within the bores. I had noticed that my Leb L7 and my Sel CT tube's intrusion was less [?about half as much] as in other cls available to me. I had credited both the L7 and CT to having clearer, better sounding, "pinch Bbs" as well as having good clarion "access". Galper's [Speaker Vent] pat 5,241,890 and M Selmer's 2,226,536 and Sciacca's 3,413,884, all show lesser intrusion with some of the tube's length outside of the U J body, [ on a "boss" or other terminology perhaps?]. It would seem that, possibly, our makers' research to obtain improved Bbs by this simpler method may have helped defeat the more complex method's "marketability" except for their use on the larger clarinets, alto, bass and contras, where the problems are more severe. I'll appreciate all thots and comments on this "momentous" question. Don

Thanx, Mark, Don

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Re: Register Tube, Bore Intrusion?

Author: tictactux ★2017
Date: 2007-05-16 19:07

I have a restoration project where the register tube hardly protrudes into the bore at all (just a bit more than the thumb tube), but is rather long outside the bore. It looks a bit like a one-piece Galper vent, or the tubes found in German clarinets.
Will let you know how it sounds once it's washed, oiled, powde-err, buffed and repadded.

--
Ben

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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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