I love my 983 but…. I felt I could be a bit easier to start soft notes, to do flexibilities easier and a little bit more to lean on in general. I got this from my experience with Thein. When I visited their shop we did some optimizations to my Thein bass trombone. This included sleeving the mts. That was quiete a big improvement!
It occurred to me that I could try sleeves in the mts of the 983 and see what that brings me.
I started with various plastic inserts. All the things I looked for seem to happen with the inserts. I asked a tech to make metal sleeves. A short one (15mm for the large end and a long one 30mm for smaller end. After a bit of experimenting I am keeping the sleeve in the large end. So just one sleeve on the large end
If you have a 983 you should give a try! I tried a lot to fix it at the mouthpiece, but now most mpc’s work!
983 modification: mts sleeve
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arpthark
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Re: 983 modification: mts sleeve
Nice. A lot of players have messed around with sleeving larger tubing to improve response, etc. Supposedly it helps tame the somewhat amorphous low range on the larger B&S F tubas, but I've never tried that tack.
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shovelingtom
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Re: 983 modification: mts sleeve
Is this what the “acousticoil” was attempting to be?
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- martyneilan (Mon Sep 14, 2026 1:14 pm) • Mary Ann (Wed Sep 16, 2026 9:37 am)
Re: 983 modification: mts sleeve
Not really, I believe they are 2 completely different things. The common thing is that they narrow the bore and have an effect on response..... Sleeving is not a new thing and has been around for a long time I believe.
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anadmai
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Re: 983 modification: mts sleeve
Bringing in the sleeves.
Bringing in the sleeves
We will come rejoicing,
Bringing in the sleeves.
Bringing in the sleeves
We will come rejoicing,
Bringing in the sleeves.
1906 Henry Distin Euphonium(JUNIOR)
1952 B&H Imperial Trombone(HASTINGS)
2015 Sterling Virtuoso Baritone(MARGARET)
1988 Besson/B&H Sovereign 967(BRAMWELL)
2023 Dillon Eb Bass 981S(ALBERT)
1967 Besson New Standard Eb Bass (BOB)
1952 B&H Imperial Trombone(HASTINGS)
2015 Sterling Virtuoso Baritone(MARGARET)
1988 Besson/B&H Sovereign 967(BRAMWELL)
2023 Dillon Eb Bass 981S(ALBERT)
1967 Besson New Standard Eb Bass (BOB)
Re: 983 modification: mts sleeve
Eric, this is a great read: viewtopic.php?t=805&hilit=601