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I am playing the Gregson this semester and the 6th partial of my horn (a Rudy CC) is EXTREMELY
SHARP!!! (30+ cents) I've had several people (including my professor) play on the horn and got the same result. Does anyone know any alt fingerings (Starting from 4th line G to second ledger line above the staff E) that can help me tame the pitch?

What's your professor's opinion?
Maybe? . . . ask the people who played on your tuba

Mash buttons and buzz an in tune pitch until the right noise comes out?

Not to be snarky, but 4th line G may be part of the problem.

Start with fingering an octave lower? Pull slides. Figure out, on your own, which other harmonic series those pitches are part of.

If you are playing Gregson, these things should be second nature by now.

Good luck!

get an EEb compensated tuba and a 24AW mouthpiece and you will be fine (it is what it was composed for, after all)

Seriously though, this is why you are a music student, to learn how to deal with these issues, talk to your teacher, experiment with the fingerings and find out for yourself where the notes are most in tune, Im afraid that there are no short cuts on this journey, but good luck anyway

Figure out which fingerings are the best ones, and then regard them as the correct ones. It is also easy and commonplace to push the pitch up to alter the tone, and of course you must resist doing so.
Try tuning up your octaves, starting with the pitches you can best control. Move into the problem range a step at a time. It takes a lot of time and patience.

swillafew wrote:Figure out which fingerings are the best ones, and then regard them as the correct ones.

THIS!!!

Resistance is futile, you will eventually learn how to play these "alternates" as second nature, and sound normal. I have a tuba I work as a 3 banger 80% of the time, with v4 and v5 used a few select notes

Get a whammy bar for the tuning slide.