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Aside of the red front plate being vertical, what would prevent a Stonelined sousaphone mute from working in a bell front tuba?

Even between the Conn 40K and 26/28K there are huge differenceas in throat diameters and in the radiuses of the bends between the inside of the bell knee and the lower flare.

As I interpret the measures, Conn designed all of their non-Jumbo sousaphone bells to fit into the same size of case. With the large bore 40K the said bend radius is much smaller than with the medium large bore Eb sousaphones.

Klaus

I am planning on some designs of sousaphone and bell-front mutes for my own usage, where dampening of practice noises are a main consideration. With you I might assume that such mute rather would be applied in certain orchestral contexts. I may have ideas for that too.

Is your goal to get the brighter metallic sound to fit with straight muted trombones and still stay reasonably in pitch? Possibly with options to mellow that sound?

Materials, except for some standard tubing, will be flat without bending and will be obtainable from stores supplying plumbers and carpenters, maybe except some sheets of felt and cork known from woodwind repairs.

Klaus