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Thought I'd share a picture here of an experimental work that we've just about finished. Most of the horns that we've put together are based on the King 2341. This one is based on the Reynolds BBb body with a 20" bell off an old monster-size EEb. It's leaning towards being a 5/4 CC, since it has larger branches than the 2341's. It has a little darker sound. (No water keys yet; hence the black tape around the bottom tuning slide crooks. That is a 5th valve downstream from the valve cluster without the tubing for it in place.) Sorry, not for sale.
Do you know if anyone else has noticed the potential for a nice CC tuba in that old stovepipe belled Reynolds BBb before?

This horn has a big King bell on it also. I checked that 6th partial after Bloke's comment on his horn. This one's top space G is a little sharp (not SHARP) where it centers but only 5 to 10 cents according to equal temperment; very close to a perfectly in tune 5th above the C below it. It's pretty easy to adjust down from there. My 5/4 Rudy CC centers that note at about the same pitch level. Personally, I'd rather have the Gs a litttle sharp rather than tending flat.
Interesting question: For the horn to respond best should the natural overtone series of a tuba have harmonically in tune relationships to the fundamental rather than being in tune according to equal temperment? i.e. the open E a little low and the open G a little high on a CC tuba.
From my experience it seems the sweetest playing horns that I've tried exhibit these natural harmonic tuning traits. Your thoughts, experiences?