Posted: Fri Jun 02, 2006 5:18 pm
Well, think about it--to go from approximately 60 cents sharp Eb to an in-tune F, you'd have to remove enough tubing to raise the pitch by 140 cents, which wouild be about 6.5 inches on each tuning slide leg (which isn't possible, so you'd have to get it from somewhere else)--and you'd have to cut the tuning slides.
To go from a 60 cents sharp Eb to an in-tune Eb, you'd have to add enough tubing to account for that 60 cents, which, on an Eb tuba is about 2.5 inches added to the main tuning slide legs. For the rest, you can pull the tuning slides to bring the valves into tune.
Neither approach addresses how the resulting intonation would be--and it could turn out to be pretty awful in either case.
To go from a 60 cents sharp Eb to an in-tune Eb, you'd have to add enough tubing to account for that 60 cents, which, on an Eb tuba is about 2.5 inches added to the main tuning slide legs. For the rest, you can pull the tuning slides to bring the valves into tune.
Neither approach addresses how the resulting intonation would be--and it could turn out to be pretty awful in either case.