I am willing to sell anyone...
(and I tend to offer very competitive pricing, just fwiw...)
The YELLOW brass version of the JP (same high-grade assembly, regular 70:30 brass, and utility-yet-sturdy zipper case), which is the JP277...
...and I'm ALSO willing (if pre-paid) to simultaneously order them a 15" bell made by Yamaha for their YEB-321 model...
The combination of the Yamaha bell and the JP277 everything-but-the-bell will result in a FINE (and all-new) 15" bell 3+1 yellow brass compensating E-flat tuba.
I'm under the impression that the YEB-321 bell is very much a copy of the Besson/B&H 15" E-flat bell.
The only other possible consideration might possibly (??) be that subtle main slide bow extending could be required...(since the 19"-bell alteration seemed to flatten these instruments...so I'm guessing that a 15" bell alteration to a 19" bell instrument could sharpen them).
That having been said, I play in some ensembles (even paid

) that seem to LOVE to hang around A=444-or-more, that I also might suspect that a slightly sharp-natured tuba might fit in with quite a few ensembles.
JP277
YEB-321 bell
982 mouthpipe
https://www.dawkes.co.uk/mouthpipe-and- ... r-982/8302