Author: Chris P
Date: 2021-05-20 12:42
With all plateaux clarinets, all the fingerholes are covered by fingerplates and those fingerplates are in turn linked to the vent keys they control.
The LH thumbplate will close the open G vent to give F natural, but won't close the LH1 fingerplate.
The LH1 fingerplate will close the vent pad cup via an adjusting screw linkage to give F# (with the thumb off) or E (with the thumb on), just like that seen on alto and bass clarinets.
The LH2 fingerplate will close the E/B vent pad cup via a linkage to give D/A, but will remain open when long Bb (xxo|xxo) is played.
The LH3 fingerplate is normally completely independent to the rest of the mechanism.
The RH1 fingerplate will close the C/G vent via a linkage (like that on sax RH main actions) to give Bb/F, but won't lower any of the other RH fingerplates.
The RH2 fingerplate will also close the C/G vent to give B/F# and A/E when RH1 is held down.
The RH3 fingerplate can either be linked to the C/G vent just like the RH main action on saxes which will mean a longer back bar to link it which will need to be bridged for reliability, or can be left independent as it is on Vitos with a much simpler linkage in the form of a bar bent into an L-shape
All the fingerplates will need their own springs and key feet and the existing tonehole chimneys will need to be profiled to give them crowns like all other countersunk toneholes to seat pads onto, either maintaining their height to preserve the existing tuning and characteristics of the instrument or shortening them and doing tuning work as shortening them will sharpen the notes that issue form them.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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The Clarinet BBoard
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