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I shortened the 1st and 4th slides this evening. I am surprised what a difference it made. The MTS should be out about an inch on this horn generally. However when valve combinations are added, they are significantly flat. At least they were! I agree with Joe that this was meant to be a Eb tuba. Now that I shortened 1 and 4, all combinations, except 2nd alone, follow normal intonation tendencies. Now I have to figure out how to get to the little second slide without disassembling half of the valve section to get to it.

As I pontificate redesigning the 5th valve configuration, I realize how tight the space is after the 4th valve to the “plumbers loop.” Hmm..

https://photos.app.goo.gl/y2vZATg3P2fQqG1B7

JH

Nice job, Jason!

I have hosted your two photos so that they can be displayed in the thread.

I'm glad I remembered that observation and that it came to your aid.
You did a nice job.