TubeNet

http://www.dasorchester.de/de_DE/index.html" target="_blank
You'll find the answer here.
I don't have a subscription, but if i wanted an orchestra job I would.
Peace.
ASG

For the most of the auditions that I have seen, the required work may be:
LEBEDEV Concerto in One Movement
Strauss Concerto #1
or the VW
Of course in some cases there are etudes that have been asked (low etudes played on the F tuba).
Hope that helps,
DK