Posted by Mike Effenberger on December 07, 1999 at 22:58:38:
In Reply to: Turning a 186-4u into an F tuba? posted by Curious on December 07, 1999 at 00:33:30:
Really tricky business, but here's an interesting page that might give you some idea of what ideas are involved...
http://www.euronet.nl/users/tubaness/how-to.htm
Good luck, and keep us posted (sorry)
-Mike