Posted by Klaus on February 10, 2003 at 11:42:42:
In Reply to: Re: Re: Re: "double" tubas posted by Mary Ann on February 10, 2003 at 10:16:55:
Joe hardly rambles around drunken. But he is a fan of fanning fiery discussions.
Joe considers his 4+2 B&S F tuba as a double instrument with serially arranged valves.
The 4th valve puts the instrument into CC. Playing that "fake" CC he uses valves ## 5 and 6 for whole and and half tone step.
What about the missing valves of the "fake" CC?
The valves ## 1,2, and 3 of the F "side" are recycled with new functions:
The 3rd acts as a slightly overlong whole step valve on the "CC" side.
The 1st acts as a somewhat overlong half step valve on the "CC" side.
The 2nd acts as a somewhat overlong quarter step valve on the "CC" side.
As I am sure you are familiar with the 5 valve single horn in Bb, where the 5th/stopping valve in itself equals a 3 quarter tone step, I trust, that you will understand how odd valve combinations actually can add up to something useable.
Which are the benefits of using a serially arranged double tuba over something similar to the parallel arrangement of the double French horn?
Two story rotary valves blown up to tuba dimensions were so bulky and heavy, that these factors would prevent a fast action!
The picture illustrates the serially arranged valve section of a 4+3 double Kruspe tuba in F and BBb. That tuba had its own heated thread some time ago.
Seven more .jpg's concerning that model can be found through the link just below here.
Klaus