It may simply be that the TubaExchange is a high pitch horn, while yours was built (or modified) to low pitch.
I have seen a Conn helicon that was built in 1925 that was made to High Pitch.
York E Flat Helicon
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windshieldbug
- Once got the "hand" as a cue
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Re: York E Flat Helicon
Instead of talking to your plants, if you yelled at them would they still grow, but only to be troubled and insecure?