Author: Chris P
Date: 2008-11-05 12:05
Some thumbplate system oboes had LH1 connected to LH2 by an arm and adjusting screw, so as long as LH2 was closed, LH1 fingerplate would be held down almost closed. While LH2 remained open, LH1 would open fully so on these oboes, an open C# was possible. But it's more widespread to have LH1 completely independant from the rest of the LH main action and its own adjusting screw bearing against the wood.
Similarly with some fully automatic oboes, LH3 would lower LH1 almost closed by the long bridge linkage (and an adjusting screw on LH1) that controlled the automatic 8ves (connected to LH3). Though automatics are often built with LH1 independant from the main action.
Backing off the LH1 adjusting screw on an S10 will mean you have to roll LH1 down instead of lifting LH1 for the lower part of the upper register and lower altissimo, and still won't give a good open C# as LH1 fingerplate won't open fully.
Only on Howarth conservatoire systems does the LH1 fingerplate have the full venting to give open C# (and can be screwed right down too).
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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