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I believe it's a Meinl Weston but don't know the model number. There was a discussion thread on Dave Werden's forum about the design and whether it was a 'screw-on-bell' or tone ring. We didn't see much advantage in having a screw-on-bell that close to the rim. There's a YouTube video of the Melton Tuba Quartett performing "Grand Concerto for 4 Tubas" by John Stevens using one of those.

Konzertausschnitt Melton Tuba Quartett & Duisburger Philharmoniker

Looks like it could be a Meinl Weston 751 Phoenix with a tone ring. That model uses a factory main slide kicker that looks the same as the one in your picture.

Looks a bit like Oystein Baadsvik's collapsible Eb tuba.

http://samquinones.com/reporters-blog/2 ... il-rights/

For those who may not know, Oystein's horn comes apart in three pieces. The bell screws off. Then the "coupling" ("ferrule"?) connecting the bell to the bottom of the bell stack comes off. The bell can "nest" in that coupling for packing purposes. Finally, the key/paddle assembly is hinged and will fold down to reduce its exposure to contact and damage.

He basically tosses the whole thing into a small suitcase, and off he goes.

But his is a front-action horn.

Those Euphs have amazing tone in that recording! (due to players as well of course).

ghmerrill wrote:For those who may not know, Oystein's horn comes apart in three pieces. The bell screws off. Then the "coupling" ("ferrule"?) connecting the bell to the bottom of the bell stack comes off. The bell can "nest" in that coupling for packing purposes. Finally, the key/paddle assembly is hinged and will fold down to reduce its exposure to contact and damage.

He basically tosses the whole thing into a small suitcase, and off he goes.

But his is a front-action horn.

For a more in-depth description (with pictures) see here: http://www.baadsvik.com/tuba-pages/arti ... e-solution

Nice!
this is very interesting from an engineering point of view
so why isn't this mass produced?