Author: clarnibass
Date: 2020-10-25 09:11
Bass clarinets with vent holes in the bell (e.g. current Buffet low C) are made so that low C is in tune (supposedly) with it. If you plug the hole low C is extremely flat.
The Selmer Privilege without the open hole is made so low C is in tune (again, supposedly) the way it is. Adding an open hole would make it sharper. It would have by far the largest effect on the low C compared with other notes.
It has a much smaller effect on higher notes, practically none for the higher notes you mentioned. Adding it would cause more problems than it would solve, unless, low C is already very flat. It seems that the low C with an open hole is the one thing you can't check with your test.
However, I remember Henri Bok had a vent hole on his low C Privilege (it was more than a decade ago that I saw it). I don't remember what the configuration was, but possibly he used a low Eb Privilege bell, which both a key and a vent hole, or maybe he had an extension and left the bell key off. Maybe ask him. If the low Eb bell is made in a way to be a little longer so it works with the vent hole on the low C model, it's weird that they have two different bell designs (it's much better for manufacturing to use the same bell), so this makes me think it's unlikely that it works.
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The Clarinet BBoard
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