Posted by Kenneth Sloan on November 27, 2002 at 23:07:45:
In Reply to: Re: Re: Re: Basic lengths of tubas posted by Pat on November 27, 2002 at 08:58:37:
Without commenting on your other points, I'd like to look at your claim that "an octave should double the length".
Not so - because of a feature you have already identified - the bell.
When you double the length of the tubing, you may not double the size of the bell - so, the "bell correction" is different.
This would account for small differences from an ideal "octave = double the length" rule.