 The Clarinet BBoard
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Author: jmsa
Date: 2012-06-14 23:18
I have one of the first R13's serial number 49892 which has the rounded trill key guide, the cut out on the lower joint under the crows foot key but does not have the separate posts for the A and G# key. It does have the following factory stamp on the upper joint opposite the first chimney and the same stamp on the lower joint between the posts of the Eb key.
Stamp looks like this.
R
42
Does anyone have any information about either the stamp or the post and cutout configuration. After I finish the restoration I will take it to somebody who will measure the bore which will confirm that it is in fact an R13 or not.
Thanks in advance for any information offered.
jmsa
Post Edited (2012-06-15 06:05)
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Author: jmsa
Date: 2012-06-16 01:37
I borrowed a digital caliper and here are the measurements.
Upper joint top 14.66MM
Upper joint bottom 14.23MM
Lower joint top 14.35MM
Lower Joint bottom 20.33
This indicates a poly cylindrical bore which makes this a very early R13 before they changed the A and G# keys to separate posts.
jmsa
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Author: Caroline Smale
Date: 2012-06-17 18:46
Reading the diameters of a used clarinet at the tenons can be very misleading since this is the area where distortion due to age / humidity level and bore shrinkage has greatest effect.
The figures you quote are not really consistent with any clarinet and specifically not with an R13.
The figures do indicate that there has been some considerable distortion.
It is not possible to determine whether bore is cylindrical, tapered or polycylindrical just be measuring the tenons, you need a special bore guage.
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Author: jmsa
Date: 2012-06-18 11:50
Thanks for the info. I will take it to a shop in my area and have it measured properly.
jmsa
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Author: stevesklar
Date: 2012-06-18 15:49
I use a gun gauge to determine the exact bore measurements. This is measuring the bore of the upper joint from the top to the bottom.
Polycylindrical basically means that there are multiple steps in the bore that define the R13. The only way to measure this is by using a tool to measure the bore itself from top to bottom.
such as shown in this diagram - 2nd page of document
<www.woodwindcourse.co.uk/user/image/clarinet_bore_design.doc>
Keep in mind just because it has a barrel trill key guide it does not make it an R13. I tested the one in the pics here with the same identifiers as yours and it was a pre-R13 bore with a SN 485xx
http://www.ClarinetPerfection.com/clsnBuffet.htm#pre-R13
Good Luck
==========
Stephen Sklar
My YouTube Channel of Clarinet Information
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Author: jmsa
Date: 2012-06-18 16:21
Thanks for the info Steve. Does yours also have the cutouts under the crows foot? How about the leaf spring on the G# bottom key?
jmsa
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Author: jmsa
Date: 2012-06-19 20:28
Thanks again for all your valuable info. I really appreciate it.
jmsa
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