Author: jhoyla
Date: 2010-06-10 06:19
Chris, hello,
1. Have you done a suction/vacuum test on both the top joint and the middle joint?
You say there are no leaks; nevertheless, the most common cause of burbling in the low notes IS a leaky instrument. Test especially the closing of the tiny pad between LH index and middle fingers when RH 1 is down, though this is less likely with a ring-system.
Perhaps there are leaks across the joint? Is there some space between the RH D trill key connection and its receiver? You are not touching this key accidentally when playing the low notes, are you?
Also, if the F#/G# connection across the joints (Closes the G# tone-hole when you press RH Index finger) is over adjusted, both sections of the instrument may seal perfectly, but the F# key (G tone hole) may not seal when the instrument is assembled. Twist the joint to disconnect all the connections and try the low notes again.
Are you sure there are no leaks around the tenon joint? These can be either due to the cork being very worn, or even a leak between the wood and the socket of the middle joint.
2. You do not mention whether the reed is tight in the reed-well. Is it too loose? Some reed-wells can be very wide. You can purchase staples that use O-rings to seal, which may resolve this problem.
3. Are you checking the tuning of the instrument with a tuner?
The reason I ask is that your comparison photos show a difference in length between the two instruments of about 5 mm, though it is hard to tell. If the oboe is very sharp compared to modern instruments it may be made to play perfectly, but be pretty useless for anything other than unaccompanied solo work.
J.
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