In a message dated 6/13/2008 1:10:33 AM Central Daylight Time,  [EMAIL 
PROTECTED] 
writes:

Question  to the specialists: what was the bore of the very,
very old Conns ? Anybody  knows ? In millimeters, please. To
compare: Viennese bore (inside diameter  of the cylindrical
tube) is 10,8 mms.



Hello Hans, 
 
I hope all is well with you and yours and that 
you are enjoying retirement.
 
I have measured Conn 8D number 320445 which was 
made in the fall of 1937.  The 8D was introduced in 1938 
and, according to Jimmy Decker, this was the 6th 8D 
made.  The measurements were made at several points 
including the leadpipe, the 6 valve slides and the Bb and 
F horn tuning slides.  The measurements were consistant 
at all points and were 11.8mm (.465 inches).  The modern 
8Ds are listed at .468 inches (11.9mm).  I measured a 
Texas 8D and another Elkhart 8D and they both measured 
11.9mm (.468) at several points.
 
The weight is 4 lb. 12 oz.  For comparison, my Texas 8D 
weights 5 lb. 2 oz. and the Elkhart 8D weights 5 lb. 3 oz.
 
  S/N        yr         mm       lb/oz        mfgr. location
=====================================
320445 (1937)  11.8mm    4 / 12    Elkhart, Indiana
770xxx (1958)  11.9mm    5  / 3      Elkhart, Indiana
Rxxxxx (1972)  11.9mm    5 / 2       Abilene, Texas
 
Hope this helps.
 
Best regards,     Jerry Old in Kansas  City



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