Re: graduated bore size


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Posted by Klaus on July 06, 2000 at 19:38:17:

In Reply to: graduated bore size posted by Karen on July 06, 2000 at 19:17:54:

Almost by definition a tuba is of graduated bore size. But the term often is pointing towards the bore of the valves being of increasing size.

The new Conns have a bore of .689 through the first 3 valves. The 4th valve bore is .732 and the 5th is .750.

As I remember the pre-wall-fall B&S F tubas they had an increasing bore through at least all of the 1st, 2nd, 3rd, and 4th valves.

The 5th and 6xt valves were a bit special because they were placed in the main tubing before the 1st valve.

Most compensating instruments have a uniform bore through the main loops of the 3 first valves. the bore of the 4th valve usually is larger, which makes the compensating loops also having a larger bore than the main loops of the corresponding valves.

Much easier to show eye to eye with real horns in the hand.

Klaus


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