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Michael Kennedy, author of The Oxford Dictionary of Music, made the famous quote you referred to.

There is a very thorough discussion of Catelinet's first performance of the RVW in a Tuba Journal around ten years ago, I think. A quick search through your local academic library should help you find that.

Best of luck on your essay!

As far as I know, Catelinet was playing a small Barlow F tuba.
Catelinet himself was not a virtuoso tubist. Towards the end of his life, he was playing mostly other instruments ( 'cello and some others I believe).
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