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
BMB F mods
BMB F mods
- These users thanked the author harrell for the post (total 3):
- the elephant (Sun Feb 01, 2026 10:25 am) • tubatodd (Sun Feb 01, 2026 3:08 pm) • bloke (Sun Feb 01, 2026 6:35 pm)
Jason Harrell
BMB J445 F
Wessex Prokofiev
Buescher 3v BBb
BMB J445 F
Wessex Prokofiev
Buescher 3v BBb
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the elephant
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Re: BMB F mods
Nice job, Jason!
I have hosted your two photos so that they can be displayed in the thread.
I have hosted your two photos so that they can be displayed in the thread.
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- bloke (Sun Feb 01, 2026 6:34 pm)
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bloke
- Mid South Music
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Re: BMB F mods
I'm glad I remembered that observation and that it came to your aid.
You did a nice job.
You did a nice job.
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- the elephant (Sun Feb 01, 2026 7:16 pm)