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I bought a jumbo-size York sousaphone a few years ago. The horn doesn't fit in the MTS or SKB cases or even a Protec gig bag. The hard case that came with it is a very, very old Conn case that's seen better days. Any leads on a hard or soft case that would work for this horn would be appreciated.

The Conn jumbo sousaphone came with two cases - one hard case for the bell and one hard case for the coil/body.

I built my own 'road case' for my Conn 'Jumbo' a few years back. I started with a box made of 2 x 2 lumber and 1/4" Masonite and put 2" foam in the bottom followed by the bell then another slab of foam to support the body. Quite heavy as you might suspect but I put wheels on the bottom. I sold it with the horn and don't have a clue where it is now.