Hello all.
My new project will be use an old St Petersburg Eb 3 rotary valves.
My ideia is, let the original 3 rotary but do a 3+1 or 3+2 but the 5th dependent of the 4th system.
I purchase a nice St Petersburg in nickel finish, and the older clock spring have a ratchet adjustment that works great.
I have in hands an old but in good conditions complete cluster 3 rotary valves but with bore size 0,787" we know that the bore size of the Eb St are 0,708".
Now it's the question, I know a better increase bore could be 0,748" but if I use the 4th valve 0,787" than 0,748"?
Maybe I will have some problems if I did this big increase?
Or the other way, change the original cluster in 0,708"and adapt the bigger bore size 0,787", I will need to change the lead pipe. its too much?
I would like to ear some experiences about this and how it works.
Many thanks
Dante
Conical bore at rotary valves
- groovlow
- bugler
- Posts: 244
- Joined: Thu Jun 16, 2011 5:21 pm
- Location: Nashville TN
Re: Conical bore at rotary valves
Seems like a big bump, maybe later in the bugle, past the MTS (in the pretzel haha).
The "privilege tones" really work on these horns, plus keeps the weight minimal.
I would get to know the horn well before altering..
Joe H
The "privilege tones" really work on these horns, plus keeps the weight minimal.
I would get to know the horn well before altering..
Joe H