[MojoBari]

It is a squeeze chamber (aka double chamber) design. So it is a small chamber diameter but is long. There are many sop MPs using this design: Meyer, Vandoren, Morgan, Ponzol, Barone, Selmer. Some use the same blank.

See Theo's site for some good chamber pics.

 

[MojoBari]

The smallest chamber volumes I have measured are found in the Runyon Sop MPs. But most of them are high baffled and may not be the sound you are looking for. The Buescher C sop MP looks the same as the Bb one but is marked "C" and is smaller on the inside. It has a smaleer chamber voulme than the Runyons.

I have a "C" Buescher. Mine was extremely bad for intonation. After a lot of work, it up to terrible now. I can lip it, but prefer to play it unaccompanied.

You can try to stick some putty in you Bb MP to see if a smaller chamber volume works better for you. There is also a C sop section on this forum and a separate forum dedicated to C mel Tenor and C sop users.