Here is an interesting video of a "tuba quartet". Check out the instruments. If you had a big head like mine (with nothing in it), you might have a bit of a time getting into that instrument. Notice what looks like Lefreque plates attached to one of the smaller horns, I think tenor horns. One a 3 valve, the other a 4 valve, both with nice and easy looking triggers. I believe they are Miraphone horns. Don't know what the tuba/sousaphone/cimbasso thing is at all. I want one of those smaller horns, heck I want one of the larger, what a hoot.
That group would be great at an Oktoberfest celebration. I miss my days in Germany!