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If you're looking for something very close in size, it's going to be tough going, but here are some ideas:.

Kanstul makes a little 3/4 BBb tuba which has a 0.656 bore, which (within a thousandth) is the same size as the York Eb (0.655). I don't know if the configuration could be adapted or not, but there's a source--and Kanstul sells parts.

The little Weril 3/4 BBb or CC valve cluster might work, even if it's a little larger (0.670'), but at last check, Weril didn't sell valve clusters.

Otheriwse, your best bet might be scavenge a cluster from something like an old 2/3/4/5J or Olds O99 which is pretty close in size.



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Is it possible in a case like this to add just a 4th valve, to make a 3+1 tuba? Easier/Cheaper?

jacobg wrote:Is it possible in a case like this to add just a 4th valve, to make a 3+1 tuba? Easier/Cheaper?

It's not too hard (usually works pretty well if you can find another 2nd valve from a like 3-valve block). Usually, the biggest problem is figuring out where to route the 4th valve tubing.

Chuck(G) wrote:

jacobg wrote:Is it possible in a case like this to add just a 4th valve, to make a 3+1 tuba? Easier/Cheaper?

It's not too hard (usually works pretty well if you can find another 2nd valve from a like 3-valve block). Usually, the biggest problem is figuring out where to route the 4th valve tubing.

Like Chuck said... get a similar valveset and remove the 2nd casing... leaving as much of the connecting tubing as possible. Fashion a sleeve to join the old 3rd casing to the new 2nd casing (now the 4th) and figure out where to put all the tubing. Pictures of a similar conversion on a Conn BBb sousa are here:

http://members.evansville.net/dschultz/projects.htm