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Thread: Dismantling of 2441 driver on video!

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    Dismantling of 2441 driver on video!

    Here is a guy dismantling a 2441 driver and replacing the plastic throat with a new bronze one. My question is the obvious, since after this operation the magnetic circuit of the alnico magnet is going to be open, my understanding is that the magnetic force is going to collapse or loose part of its strength. Am I right or this operation is normal and can be performed with no loss of magnetizing strength?


    Here is the video:
    https://www.youtube.com/watch?v=wvWSg2tpFLk

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    Quote Originally Posted by panos29 View Post
    Here is a guy dismantling a 2441 driver and replacing the plastic throat with a new bronze one. My question is the obvious, since after this operation the magnetic circuit of the alnico magnet is going to be open, my understanding is that the magnetic force is going to collapse or loose part of its strength. Am I right or this operation is normal and can be performed with no loss of magnetizing strength?


    Here is the video:
    https://www.youtube.com/watch?v=wvWSg2tpFLk
    There is no "circuit", it's a permanent magnet. It's not an electro-magnet in which case the field is maintained until the circuit is broken resulting in total collapse.

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    I really think you are mistaken, if you search in this forum you will find in so many threads that if you break the magnetic circuit by removing the plate of the driver the alnico magnet looses a big part of its power.

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    Junior Member macsic's Avatar
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    Interesting, but where to find this bronze tube?
    Music is emotion.

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    Quote Originally Posted by macsic View Post
    Interesting, but where to find this bronze tube?
    The guy posting the video is trading these on ebay.pl

    100 euro per pair, not that bad, but there is the catch of magnetization strength loss, maybe it can be installed through the front?

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    Senior Member richluvsound's Avatar
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    Remag ....

    More10 has done this upgrade ....

    demag the driver , dismantle it , replace throat and remag to original spec ....

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    Quote Originally Posted by richluvsound View Post
    More10 has done this upgrade ....

    demag the driver , dismantle it , replace throat and remag to original spec ....
    This is the obvious, what if there is no availability of mag-demag utility in a country?

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    Senior Member richluvsound's Avatar
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    Always willing to help if I can ....

    Quote Originally Posted by panos29 View Post
    This is the obvious, what if there is no availability of mag-demag utility in a country?

    Send it to me and ill help or send it to Italy or Berlin .....

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    Hi,

    and what might have been the necessitiy for replacing the plastic throat? Can it degenerate?

    Best regards!

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    Quote Originally Posted by Kay Pirinha View Post
    Hi,

    and what might have been the necessitiy for replacing the plastic throat? Can it degenerate?

    Best regards!
    There are alot of people with cracked throats

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    Ok, I as a noob didn't know that. But I didn't recognize a broken throat in this video?

    And if a throat is already cracked, wouldn't it be easier and not that dangerous to remove it from the front and replace it without dismantling?

    Best regards!

    Btw, here's an example for a cracked throat:


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    Quote Originally Posted by richluvsound View Post
    Send it to me and ill help or send it to Italy or Berlin .....
    Where in the UK we can do remag?

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    And who in Berlin does it?

    Best regards!

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    Senior Member richluvsound's Avatar
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    Guido ....

    Quote Originally Posted by Kay Pirinha View Post
    And who in Berlin does it?

    Best regards!


    Contact Guido , he's used them

    Rich

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    Guido at ; Behringer-Electric


    Yes there is indeed a circuit in place with these old alnico drivers ( created by the cast pot and the top-plate ).

    It is common practice ( or used to be ) that when storing alnico magnets that a "Keeper-Circuit" was put in place.

    See ( click the pic );

    Googling Magnet Keeper will lead one into the heart of this topic ( unfortunately I couldn't find an expected percentile-loss number > when breaking the magnetic circuit ).



    PS:
    It's a crying shame that this web-site doesn't have a definitive article ( in our reference section ) outlining the dangers of breaking the magnetic circuit ( as shown in that ill-informedYouTube video ).

    Maybe Robh3606 could contact Greg Timbers to see if he would write one for this Web-Site.

    I'm sure if G.T.s name was attached to this information there'd be little to no push-back .

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