Buzzing in Axial Flow Valve?

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katieplaystrombone
Posts: 1
Joined: Tue May 14, 2024 5:45 pm

Buzzing in Axial Flow Valve?

Post by katieplaystrombone »

I recently purchased a used Bach 50 bass trombone with a double axial flow valve setup. It ended up needing a number of repairs, including replacing the inner valve rotor on the second valve. The valve works and sounds great now, except that there is a buzzing coming from that area when that valve is in use. The buzzing doesn't happen anywhere else or at any other time. My repair tech checked all the braces and linkages and we can't figure out what could be causing it. Any ideas?
Bonearzt
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Re: Buzzing in Axial Flow Valve?

Post by Bonearzt »

Check and oil the linkages with a thick oil, and also make sure the stop arm is secure on the rotor spindle.
The stop arm needs to fit tightly before the screw is tightened.
Eric Edwards
Professional Instrument Repair
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"If you must choose between two evils, choose the one you haven't tried yet."
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Crazy4Tbone86
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Joined: Tue Jan 14, 2020 10:52 am

Re: Buzzing in Axial Flow Valve?

Post by Crazy4Tbone86 »

In a double valve set up, there are A LOT of solder joints. A small leak in any of those soldered areas could create a hissing or buzzing sound. A leak can also make the horn rather inefficient as well.
Brian D. Hinkley - Player, Teacher, Technician and Trombone Enthusiast
Elow
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Joined: Mon Mar 02, 2020 6:18 am

Re: Buzzing in Axial Flow Valve?

Post by Elow »

Is the screw ring to secure the two pieces together tight? Tighten it to where the valve does not move freely and loosen it just until the valve works well.
hornbuilder
Posts: 881
Joined: Wed May 02, 2018 9:20 pm

Re: Buzzing in Axial Flow Valve?

Post by hornbuilder »

That would indicate to me that the valve is actually not fit correctly. The ring should be snug, the valve should not leak, and it should rotate freely.
Matthew Walker
Owner/Craftsman, M&W Custom Trombones, LLC, Jackson, Wisconsin.
Former Bass Trombonist, Opera Australia, 1991-2006
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