Page 1 of 1
Bb Valve Trombone to C
Posted: Tue Jul 02, 2024 1:25 am
by SFA
I believe this requires 12" to be removed at the main tuning slide (6" each leg) but I have no idea what happens at the
1st, 2nd & 3rd valve tuning slides. How is this calculate please.
Re: Bb Valve Trombone to C
Posted: Tue Jul 02, 2024 6:24 am
by ithinknot
Basically, per leg it's 6" in the cylindrical TS, 3/4 for the 1st valve, 3/8 for the 2nd, and 1 1/8 for the 3rd.
If you're interested... the equal temperament semitone ratio is 1:2^(1/12), thus 2^(2/12) for a whole tone, very close to the just major tone ratio of 9:8.
|
Bb |
C |
difference |
per leg |
| open |
108 |
96 |
12 |
6 |
| 1st |
13.226 |
11.756 |
1.470 |
0.735 |
| 2nd |
6.422 |
5.708 |
0.714 |
0.357 |
| 3rd |
20.434 |
18.164 |
2.270 |
1.135 |
Re: Bb Valve Trombone to C
Posted: Tue Jul 02, 2024 8:45 am
by SFA
THANK YOU. THAT'S GREAT.