Manufacturing Companies for Amico Brass Mini Ball Valve to Gambia Manufacturer

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    Checking and adjusting tuning slides for parallelism

    Why slides are often not parallel after soldering:

    As the brass tuning slide crook heats up during the soldering process, it expands outwards and makes the slide wider. The solder cools and hardens before the crook can return to its original size.

    As the crook itself cools, it puts pressure on the soldering jig by squeezing the legs together. The result is an unparallel slide which is full of tension and will not run smoothly in the horn.

    Caliper measurement comparing width at top and bottom of slide, immediately after soldering:

    1.942 at top
    1.929 at bottom

    The difference of .013 of an inch between the top and bottom may not seem like much, but it’s enough to cause the slide to run very poorly in the horn. The other issue is that the unparallel slide has internal tension which doubles when the slide puts pressure on the outer slide legs of the horn.

    Luckily, there is a fix for this. By heating the solder joints very quickly and keeping the slide crook cool, the slide is able to “reset” itself under the ferrule joints. This releases the tension in the slide crook and also allows the slide legs to return to parallel.

    A new caliper measurement of the same slide, after adjustment.

    1.944 at the top
    1.944 at the bottom


    It’s not only important that slides be parallel for optimum playing but also for longevity. A parallel slide will wear more slowly and stay airtight longer, than one that is not.

    Finding a maker who is willing to spend the extra time on these crucial details is important!

    Thanks for watching! Please email me at if you have tuning slide or any other horn equipment related questions.

    Jacob Medlin
    Medlin Horns

    Music by fellow hornist Greg Alonso.

    Greg shows how to test the water pressure on you house to be sure that it is not too high (and can cause leaks and damage) and also how to check the health of your pressure regulator.

    Two types of pressure gauge are shown.

    For more information go to

    PLEASE comment and ‘Like’ this video!

    Intro music by Jon Hasz and Daniel Yeltzin of RamonaMusic Center

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