Posted by Art on February 08, 2001 at 23:46:53:
In Reply to: 5th valve options & benefits? posted by Steve Inman on February 08, 2001 at 19:07:22:
I wrote an article on this very subject. It's in the TUBA Journal Vol. VIII, No. 1 (summer, 1980). Dr. Young and several others referred to it in articles that followed. E-mail me if you'd like a copy.