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OT (?) installing air-core inductors

Discussion in 'Electronic Repair' started by William Sommerwerck, Oct 23, 2013.

  1. There's an obvious answer to the following question, but I thought it might be
    a good idea to see if someone had an even better idea.

    I'm restoring a pair of the original Advent speakers. These were made in late
    '75 and have the first version of the crossover. The crossover and amplifier
    terminals are on a board that's glued to a hole cut in the back of the
    speaker. Other than breaking the board loose, there's no way to remove it.

    All parts will be upgraded. The original iron-core inductors will be replaced
    with Alpha-Core 14ga air-core inductors. I doubt this will have much of an
    effect on the sound -- but the inductors can't saturate at high levels.

    There are two obvious ways to install them. One is to simply glue them to the
    board. The larger one weighs 1 pound, 7 ounces (!!!) so it has to be glued
    down tightly. The smaller one has to be mounted on its "side", so it's at
    right angles to the larger. This doesn't provide much surface area for a tight

    There's no guarantee even the best adhesive won't eventually give way. I don't
    want to have to open the speaker in a few years and re-glue the inductors.

    The other obvious way to mount them is with locking cable ties passed through
    small holes drilled in the crossover board. This alters the speaker in a
    visible way -- but it's hardly a big deal.

    Any thoughts? Am I missing something obvious?

    Thanks in advance.

    "We already know the answers -- we just haven't asked the right questions."
    -- Edwin Land
  2. "David Platt" wrote in message
    Not a bad idea. I'll give it some thought.
  3. N_Cook

    N_Cook Guest

    Would the Xovers ever get hotter than 50 or 60 degree C ?
    If never then hot melt glue. Heat the coils and the other surface with
    hot air gun at a low setting and then apply hotmelt glue, forms a much
    stronger bond than if applied to unheated surfaces. If you have to
    remove them later then just apply hot air and leverage
  4. "N_Cook" wrote in message
    They'd barely rise above ambient.
    I'll consider that. The manufacturer recommends using hot-melt adhesives, so
    it should be okay.
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