bort wrote:ANYWAY... any more thoughts on the original question?
Before the 6/4 craze took over orchestral tubists, the tuba's job was often to "cut through" and a 184,185, small bell 186, 3/4 Rudy or similar did this job, with a 163 Alex at the big end of the scale. The tuba was more of a solo voice and about projection. The upright basses provided the deep foundation. Heck, even the original "wind ensembles" modeled more after an orchestral type of instrumentation used 1 or 2 upright basses to fill out the bottom.
The symphonic band was all about having that deep rich bass foundation coming from the tubas, and 20J's, 345's, and Martin 6/4's did an admirable job.
Fast forward to today, where orchestra players use large 5/4 or 6/4 tubas. It is a very different timbre than the orchestral tuba of a half century ago. The tuba is very much a part of the foundation of sound, as opposed to an independent projecting voice. Very similar to the old band style sound, just with more clarity (and hopefully better pitch).