 The Clarinet BBoard
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Author: dibble
Date: 2013-11-16 12:37
Are R13s of the "golden era" supposed to be played with bores that are narrower than the upper joint? The one that came with my 1960's R13 has a significantly smaller bore.
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Author: Ken Shaw ★2017
Date: 2013-11-16 18:28
I have excellent barrels with bores significantly smaller than the mouthpiece or the top of the upper joint. I think the shape of the barrel bore (cylindrical or reverse taper) is much more important. The only criteria are how well it tunes and plays.
Ken Shaw
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Author: Caroline Smale
Date: 2013-11-16 20:35
My 1963 R13 (ser. 76xxx) has a barrel that matches the diameter of the top bore exit (14.85/14.90mm) and the barrel bore profile is parallel.
I don't believe Buffet started making R13 barrels with small reverse cone until very much later on and even then I think they were an option. I think they were introduced with the RC model.
Incidentally the top joint of my R13 appears to have a conical reverse taper and not a 2 step polycylindrical shape has anyone else found this? were Buffet experimenting with the bore at this time?
The parallel section of main bore in top and bottom joints is 14.60 mm a smidgen less than the current 14.65
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Author: Ken Shaw ★2017
Date: 2013-11-16 21:23
The polycylindrical bore in the upper joint, as introduced in the R13, has two steps, but the increments are too small to be seen by looking down the bore. Also, the segments are blended into each other.
Jean Carré made many prototypes when he was developing the R13 in the early 1950s, some of which were sold (without serial numbers) at the factory. I've seen and played a few. By 1963, the design was well set, though small changes were slipstreamed in from time to time. There was a big change in the late 1960s, when the register vent was moved upward and made smaller, to correct intonation problems between registers in the original design. For much more, see http://www.woodwind.org/clarinet/Equipment/Intonation.html.
Ken Shaw
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Author: Caroline Smale
Date: 2013-11-16 23:07
Hi Ken, I have a bore guage which I slide slowly down the top joint and to best of judgement there appears to be a virtually linear decrease in diameter between the top and a point just below the speaker, of course allowances have to be made for 50 years of aging but the overall dimensions of bore seem not to have changed much over those years.
Testing other R13s does show a fairly abrupt change in diameters and on many you can often perceive these changes by letting reflected light glance off the bore walls.
That's why I am rather curious about my instrument which incidentally I purchased in the USA some 30+ years ago.
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