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Thread: Rebuilding 435be, sourcing correct ferrofluid and in need of O-ring

  1. #1
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    Rebuilding 435be, sourcing correct ferrofluid and in need of O-ring

    I have three 435be drivers and two of them need a little work. With the diaphragms removed I saw that there was what looked to be a little metal specks in the coil gap. I cleaned the coil gap quite well and now need to replace the ferrofluid. What should I be purchasing? Also I am in need of one of the O-rings that goes around the diaphragm and holds it in the back chamber. I hope that makes sense. Name:  63BA4121-2320-4408-B65E-9023A07B7B44.jpeg
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    Here are some photos of the O-ring and you can see it installed with the diaphragm in the back chamber.


    Thank you,
    Dan

  2. #2
    Administrator Robh3606's Avatar
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    Here is the Ferro

    Both compression drivers have 100 ul of APGS38N ferrofluid in the gap. The ferrofluid provides some damping and seals off cavity resonances. Without the ferrofluid the curve gets rougher and it is audible. - Courtesy of Doug Button - JBL


    The O ring you should be able to get at a hardware/plumbing supply.

    Rob
    "I could be arguing in my spare time"

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    Quote Originally Posted by Robh3606 View Post
    Here is the Ferro

    Both compression drivers have 100 ul of APGS38N ferrofluid in the gap. The ferrofluid provides some damping and seals off cavity resonances. Without the ferrofluid the curve gets rougher and it is audible. - Courtesy of Doug Button - JBL


    The O ring you should be able to get at a hardware/plumbing supply.

    Rob
    Awesome, thank you so much Rob! Wasn’t sure if it was a special type of O-ring, but I can run down to the hardware store today for that. As for the ferrofluid, 100uL is wayyy less than I thought it would have been, I’ve used that much for small dome tweeters! Any hope of being able to purchase this APGS38N fluid? I can only seem to find APG L11. I’d really like to be able to use what JBL used.

    I also have 3 045Be drivers which I’m guessing have ferrofluid in them as well? I’ll have to research that, but for the moment I’m not touching them. I remember Greg Timbers saying that they have incredibly delicate diaphragms, much more so than the 435s. But it would be good to grab APGS38N for them as well while it’s available. I’ve replaced a lot of dried up fluid, so i know it won’t last forever. If it’s not then never mind.

    Thank you again,
    Dan

  4. #4
    Administrator Mr. Widget's Avatar
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    In my experience the orange colored o-ring material is a high temp silicone.


    Widget

  5. #5
    Administrator Robh3606's Avatar
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    Any hope of being able to purchase this APGS38N fluid? I can only seem to find APG L11. I’d really like to be able to use what JBL used.

    Yes I purchased some years ago just go here:

    https://ferrofluid.ferrotec.com/prod...pg-s/apg-s38n/

    I was able to purchase it in both bulk and in individual recharge packets specifically for the 435 drivers. The 045 does not use Ferro and Yes don't open them.

    Rob
    "I could be arguing in my spare time"

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    Quote Originally Posted by Robh3606 View Post
    Yes I purchased some years ago just go here:

    https://ferrofluid.ferrotec.com/prod...pg-s/apg-s38n/

    I was able to purchase it in both bulk and in individual recharge packets specifically for the 435 drivers. The 045 does not use Ferro and Yes don't open them.

    Rob
    I wanted to thank you for the link, I thought I had done that, very rude of me. Thank you for pointing out where to grab some. May I ask, how long should it take for them to get back to me? I made an inquiry about 1-1/2 to 2 weeks ago and still havenít received an email back. Iím just wondering if I need to reach out again.

    Thank you,
    Dan

  7. #7
    Administrator Robh3606's Avatar
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    Hello Dan

    If I remember correctly I called them on the phone. That was a while ago, I would just try again.

    Rob
    "I could be arguing in my spare time"

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