Valve bodies on trumpets/cornets

Discussion in 'Trumpet Discussion' started by hawksao, May 27, 2009.

  1. rowuk

    rowuk Moderator Staff Member

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    Hawsao,
    I guess the question is what is the point. If a REAL Committee cornet is available for cheap, why destroy it. Restore it and enjoy the unique vintage sound character of the original. The chance of it being a real player is VERY good.

    If you want to build a trumpet for cheap and have some ideas, don't destroy a piece of history, use horns that are available in abundance like Bachs, Olds, Getzen.

    The braces control resonance. For MOST bell designs this involves critically placing them. This is due to the bell being tempered (hardened) and having a life of its own when not damped. Moving the brace changes the sound, projection and intonation. More on the life of a bell can be found here: http://iwk.mdw.ac.at/Forschung/pdf_...nn_Schallbecherschwingungen-von-Trompeten.pdf . I don't know if you can read German, but pictures tell a thousand words and what is applicable here starts on page 42.

    Dave Monettes sheet bracing is actually for a different type of construction. His bells on those horns are not tempered, they are annealed and very soft. They have a much different resonance pattern and therefore much different bracing requirements. The idea is to project as much sound as possible forward to the audience. Some players have trouble with designs like this because they feel a need for more "feedback". That means inefficiency as not all of the soundwaves are projected out of the bell, rather through resonance of the bell material, reflected back to the player.

    The braces on a trumpet are also part of a feedback loop, transferring vibrations back to specific locations early in the progression of the horn. This affects how well the horn "feels" and "responds".

    My suggestion for players wanting to experiment, would be to take a standard, easy to get horn and to first convert it to a tuning bell version. You then have a possibility to try different bells very easily. A front brace can be simulated with a sound post. They you can mess with leadpipes and bracing.

    Here is some info on "frankentrumpets" and tuning bells:
    Tunable Bell Trumpets
    SPADA MUSIC AG - Tonangebend im Trompetenbau
    Bell and slide options
    Cornet Connection
     
  2. edfitzvb

    edfitzvb Forte User

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    Jun 10, 2008
    Woodlawn, VA
    However, if you bought a sound Committee cornet and tore it to pieces, that would simply be a shame.
    __________________
    Sooner or later someone always gets to the crux of the matter. You are going to cannibalize a very fine horn? That bothers me on a deep level.

    Now,,, the spirit of adventure obviouslty resides in you. Promise me you will be patient and take parts form a "wall hanger" with a crumpled bell (Cheaper, by the way,,,) and not dissect a perfectly good trumpet.

    I personally play a frankenhorn that I bought from my tech guy. I was having a Schilke worked on, and it was hanging in the shop. It was a 1954 Olds Super valve cluster and body. Somebody had run over the bell, so he put a Bach Strad 43 bell on it and brought it upi Herriot style. He added slide adjustments and scrounged braces. It was a hobby. I asked to play it and promptly bought it. It remains my primary instrument. It was a lucky accident. BUT no innocent working horns were damaged or cannabalized in the creation of it.

    By the way, did you know that cannibals won't eat clowns?
    They say they taste "funny"
     
  3. Darthsunshine

    Darthsunshine Mezzo Forte User

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    Jul 19, 2008
    Seattle, WA
    If you want to try out your theory, this might be the horn for you to try it on:

    Martin Committee model cornet for parts or repair - eBay (item 110396664863 end time Jun-04-09 04:59:03 PDT)

    You can rip out the dead lead pipe and save the bell, and turn the rest into a trumpet. It's an especially good prospect since it apparently has no serial number, which means it has very little provenance as an original collector item. It will probably go for a relatively low price for that reason too. Go for it :thumbsup:
     

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