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Maybe someone with Meinl Weston/ Melton could help you out. As I recall Heiko Triebener is a Meinl Weston artist over in Europe. There is a man by the name of Martin Matthies (spelling probably wrong) that works for TA or JA (can't remember which it is) music group and works all the shows. He knows tubas pretty well and would probably know of some recordings. If I can find his email, I'll let you know.

I wish I had a more direct source for you, but that's the best I can do.

Heiko Tribener plays tuba with the Bamberger Symfoniker. Perhaps you can get information from there: http://www.bamberger-symphoniker.de/

I have a cassette tape recording of Heiko playing the Bozza concerto with the World Youth Symphony in the summer of 1983 - we attended the National Music Camp at Interlochen together that year. Of course, Heiko was only 16 or 17 when this was made, but man, what technique! Might be a valuable tape someday...