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  1. 136HS...

    136HS I believe.

    :)
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    Tough network to copy due to the tapped coil. ...

    Tough network to copy due to the tapped coil.

    Here it is though.

    :)
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    You're welcome. Definitely worth the gamble at...

    You're welcome.

    Definitely worth the gamble at that price.

    :)
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    JBL 4892...

    JBL 4892

    All great parts in those boxes if the neodymium magnets haven't started to rust and breakdown ( reducing range and output ).

    FYI, it's impossible to determine the conditions ( of the...
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    @Ian, That's interesting. Who's words are...

    @Ian,

    That's interesting.

    Who's words are you quoting ?

    So the 435Al doesn't have an aquaplased diaphragm ? I assumed it did.

    Oldbrowndog ought to remove his non-working one to confirm...
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    I just measured an older spare-part ( short-coil...

    I just measured an older spare-part ( short-coil assembly ) that I have here.

    The Voice-Coil ( diameter ) is approx. 4 1/8" . That's center/top of metal former to center of former .

    Adding in...
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    A little bit more info; Read thread Cleaning...

    A little bit more info;

    Read thread Cleaning Aluminum Frames

    I haven't tried this phosphoric acid approach ( though it makes perfect sense ) .

    Below is one members result ( flodstroem ) ...
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    Ya know mortron you're getting way ahead of...

    Ya know mortron you're getting way ahead of yourself when you start talking about passive component values and their suppliers.


    The values you see ( within my postings ) are not written in...
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    Sorry oldbrowndog :( . I'm not 100% sure of...

    Sorry oldbrowndog :( .

    I'm not 100% sure of anything ( regarding the "Plug-And-Play" substitution of 2431h drivers for your 435Al ).

    It's really all just best guess since I don't own any...
  10. Ahhh, Okay! Perfect! Compression driver...

    Ahhh, Okay!



    Perfect! Compression driver rebuilding really ought to be childs-play for you once you understand the steps.

    You might need to build a magnet charger if you can't access...
  11. To keep you occupied ( & hopeful ), here's a...

    To keep you occupied ( & hopeful ), here's a thread over at AudioKarma ;

    Something for you do do in the meantime.


    Rusted Altec Driver Find...
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    Hi, "C5" is out-of-circuit // not used . When...

    Hi,

    "C5" is out-of-circuit // not used . When one sees a part that has no value that means it's open circuit. If one sees a part with a line through it ( + no value ) then that means it's a short...
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    Here's One Thread on the Subject...

    Here's One Thread on the Subject

    :)
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    For sure there was a good thread on that very...

    For sure there was a good thread on that very subject ( sometime within the life of this forum ).

    I'll look around to see if i bookmarked it ,

    :)
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    @oldbrowndog, Thanks for the pics. All 3...

    @oldbrowndog,

    Thanks for the pics.

    All 3 magnets you've pictured are badly rusting ( the 2, 2435H are the worst and beyond help IMHO ).

    The Japanese pricing is typical ( for them ). IOW,...
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    Oks, Read this "Effects of Loss of Magnetism"...

    Oks,

    Read this "Effects of Loss of Magnetism" thread!!

    You'll then see that you should contact LHF member "Flodstroem" to find out if you can employ him to fix your GPA 515 ( with the bad...
  17. Yes, Well;; If I had empty 4350 boxes that...

    Yes,

    Well;;

    If I had empty 4350 boxes that I wanted turn into something listenable > this is the direction I would go.

    This close-up is from an article detailing a bit of what went on making...
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    Thanks for the update Rob ( it's much appreciated...

    Thanks for the update Rob ( it's much appreciated ! ).

    Yes, great to see your comparison of the 2435H vs the 2431H ( I've been hammering away at this audible discrepancy since getting involved in...
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    Hey Rob, Regarding your successful repair...

    Hey Rob,



    Regarding your successful repair ;

    Which epoxy didn't work for you ??

    Was it the 30 minute type ?
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    Here's a good web-page on the various coatings //...

    Here's a good web-page on the various coatings // platings applied to sintered Neodymium magnets.

    Magnet Plating and Coating Options

    Here's an example pic//chart.

    8953289533

    I'm hoping...
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    @oldbrowndog, - You heard this wrong. The...

    @oldbrowndog,



    - You heard this wrong. The plating///covering surrounds the magnet as a form of environmental protection ( not the other way around ) .

    Hmm,

    I've ( also ) conflated and...
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    Hi oldbrowndog, Where did you buy those...

    Hi oldbrowndog,

    Where did you buy those 2435hpl's from ?

    FYI;

    The "PRO" 2435hpl model more or less equates to the "CONSUMER" 435Be model ( both have Beryllium diaphragms, it's just that...
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    Agreed! :)

    Agreed!

    :)
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    The way I read his posts is that he has one...

    The way I read his posts is that he has one working 435Al and one ( iffy//sketchy//unknown quality ) 2435hpl and a open-circuit 435Al ( for a total of 3 HF drivers ) .


    Whatever,


    To kill a...
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    Is there any open space ( iow; clearance within...

    Is there any open space ( iow; clearance within that fiberglass ) behind the actual le175 allowing some backwards movement ?
    -If not, you'll need to remove those 3 acorn-style nuts ( as seen in your...
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