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Forked F/B flat correction on Oehler clarinets

Author: kehammel
Date: 2022-03-05 21:46

Oehler clarinets and some higher end German system clarinets have this correction, as mentioned by Chris P in an earlier post:

http://test.woodwind.org/clarinet/BBoard/read.html?f=1&i=497052&t=497052

Using my Albert system clarinet (which lacks this correction), I compared the forked top line F, xxx xox, with the same note played using the dedicated F/B flat key, xxx xx(+key)o. I also compared the corresponding chalumeau B flats. There is a difference in tone quality, but my strobe tuner picks up very little change in pitch.

I know Chris P has previously mentioned that German system clarinets are cylindrical for most of their bore, whereas the Albert bore starts to widen higher up on the bottom joint. Is this difference in bores responsible for how the F/B flat tunes, with Alberts not needing the corrrection? Or do they in fact need it and I'm just failing to detect a difference?

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