Posted by Steve Marcus on April 10, 1999 at 00:11:40:
In Reply to: Interchangeable Bell posted by Jacob on April 09, 1999 at 14:41:01:
The Conn made large BBb tubas with interchangeable 24" bells:
Model 20J: recording bell, 3 valves
Model 21J: upright bell, 3 valves
Model 24J: recording bell, 4 valves
Model 25J: upright bell, 4 valves