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I'm looking for a Conn Giant Mouthpiece. Also, does anyone make an equivalent or a modern copy of this mouthpiece? I have a Conn Giant Tuba which doesn't play well with modern mouthpieces. It's my understanding that the original mouthpiece will make it happy.

Isn't a "Monster" Eb bigger than a "Giant"?

So what mouthpiece would be suitable for the "regular" sized Eb tuba? It's 36" high with a 17" bell. That's not a "Giant", right? It's 1910, predating model numbers.