Posted by Dave Erickson on November 07, 2002 at 10:29:15:
In Reply to: Low Pitch/Modern Pitch posted by Dan Schultz on November 07, 2002 at 10:02:22:
Did you really mean A=332? A=432 I can believe.
In any event, length is proportional to 1/frequency, so using 332 the length of your horn
is (440/332)*13.5 ft = 17.89 ft. Since a CC tuba is 16 ft, and a BBb is 18 ft, maybe
what you have is a high pitch BBb?
OK, using 432: the length is (440/432)*13.5 ft. = 13.75 ft, or 3" too long. You need to
shorten each valve loop by 1.8%, which means .1" off of second valve slide (on each side),
and similarly .2" off of first valve, and .3" off of third valve, .5" off of fourth valve.