If I am not mistaken, the Besson souzy block (with different knuckles so it becomes, in essence, a front-valve instead of a top-valve instrument) is the same as any of the non-comp BBb tubas.
Try http://www.windcraft.co.uk/" target="_blank
Besson Sousaphone
- iiipopes
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Re: Besson Sousaphone
Jupiter JTU1110
"Real" Conn 36K
"Real" Conn 36K