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Re: Tuba - Intonation/Tuning - Off Half Step
Tried different mouthpieces - I need to buy some Hellebergs.
Have you checked the mouthpiece?
It may be obstructed or bent up in such a way that it's causing this issue.
If it's not that, try a different mouthpiece altogether. Maybe he's used to a 24AW and you've got him on an 18, or the other way around. Maybe he needs a Helleberg.