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Distinguished SOTW Member
selmer 26 nino, 22 curved sop, super alto, King Super 20 and Martin tenors, Stowasser tartogatos
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3,412 Posts
Enlarging the hole would not necessarily make the note sharper unless the enlargement also moved the top edge upward. In other words enlarging the hole downward should not generally raise the pitch. Physically moving the tonehole upwards is the best way to raise pitch. Filing the chimney would theoretically raise the pitch, but it would be a minuscule change.
 

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Distinguished SOTW Member
selmer 26 nino, 22 curved sop, super alto, King Super 20 and Martin tenors, Stowasser tartogatos
Joined
·
3,412 Posts
Enlarging the tonehole by 1mm would only move the outer edge upward a maximum of .5mm, and move all edges out by the same amount. Moving it up 1mm actually makes the horn 1mm shorter.
Changing tonehole sizes can affect other parameters like venting, and could mean having to change instead of simply move key cups.
 
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