My Kurath has some tuning issues that are minor, but my new leadpipe, while making them less bad, makes them more tightly slotted so that lipping is less friendly. (I detest flipping and prefer alternates when practicable, so this is a net positive for me.)
What I want to know, is whether under normal conditions the 6th is SHORT enough to use as an alternate for 2nd on 23 combinations. As with many tubas, a lot of intonation issues come to a meeting point in this overtone series, so the various Db and Ab pitches are not in tune. I have my 6th cut so that it yields me an in-tune low B (46) as well as some other low notes that give it its raison d'être.
What I want to know — really — is what do you use your 6th valve for outside of its intended low register application? What functionality does it add that you did not expect? When do you use it as an alternate 2nd in the staff?
