Author: borris  
Date:   2007-11-23 16:26 
 First of all, I'd check the  reed carefully;  even invisible, tiny crack lengthwise immediately kills the high register. The age matters, too. 
Regarding your fingering, the most obvious thing that could affect high D is the dirty half-hole (some small possibility of water in entire B key, too).  
 If nothing above is truth, you need to check all upper joint for leaks, cracks, etc. Good luck 
   
  Edit: If your oboe has the "Philadelphia style" keywork (the split D key gets down when pressing low C key) it's VERY important the D key to go ALL THE WAY DOWN. If not, adjust it accordingly. 
 
 
 
Post Edited (2007-11-23 16:46)
  
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