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Thread: 2405 phase plug

  1. #1
    Senior Member cooky1257's Avatar
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    2405 phase plug

    Hi all,
    On purely aesthetic grounds I quite like the look of the crystal phase plug I've seen in some 2405's.
    Can anyone tell me if this item available as a spare?
    Thanks
    Cooky

  2. #2
    Obviously... not a golfer grumpy's Avatar
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    ...that would be the consumer-line version, "077", which has not been mfg'd for
    quite some time... (I'd think "no", would be an appropriate answer). I'd also think
    they wouldn't be hard to make from acrylic/plexiglas rod. :dont-know

  3. #3
    Senior Member cooky1257's Avatar
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    Thanks Grumpy,
    I was toying with making a mold of a spare black one I have and casting in polyurethane resin if I couldn't source genuine ones but plexglass rod sounds even better idea.
    I also realise that great care must be taken if tinkering around in this way so as not to damage the ring dia-maybe best left alone....

  4. #4
    RE: Member when? subwoof's Avatar
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    077 2405 plugs

    Do you actually think you can machine the compound angles, shoulders and multiple outside contours out of an acrylic rod??? The originals were cast and had a machined aluminum center piece added ( that often broke off when tightened ).

    Here is a picture of the underside of the aluminum 2405 and acrylic 077 phase plugs ( not available anymore )

    The tolerances on these are very critical and if you manage to make the acrylic ones cheap, you will own a small country from the sales...

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  5. #5
    Senior Member cooky1257's Avatar
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    And that, judging by the pic is a whole book of '2 cents worth
    So casting and a bit of Lathe action then?

  6. #6
    Obviously... not a golfer grumpy's Avatar
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    seems like a patternmaker's problem, ... perhaps "wouldn't be hard" wasn't the
    best choice of words, but very doable. Kind of like making L91 type lenses is "easy"
    technically, once you have the pattern, angle, spacing, materials, tools, experience,
    and time. I doubt anyone would make $$$ doing this... more a labor of love.

    -grumpy

  7. #7
    Senior Member edgewound's Avatar
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    I bet there's a shop somewhere in China that could knock out 10,000/day
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  8. #8
    RE: Member when? subwoof's Avatar
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    attack of the clones

    There was a guy who sold clones somewhere in the mid-atlantic region...

    I lost a hard drive 2 years ago with all that info. I think his bevels underneath were a bit off but at 80 dollars a pair, possibly worth the effort to rework. I bought a pair but don't remember selling them. If they are in the basement shop it's gonna take an Indiana Jones effort to find them.

    All we need to do is put a few pair on ebay and rig the bidding up to 1000 or so to "announce" that they are candidates for cloning.

    And while you're at it, those pesky lens too....

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  9. #9
    Senior Member cooky1257's Avatar
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    Quote Originally Posted by subwoof View Post
    There was a guy who sold clones somewhere in the mid-atlantic region...

    I lost a hard drive 2 years ago with all that info. I think his bevels underneath were a bit off but at 80 dollars a pair, possibly worth the effort to rework. I bought a pair but don't remember selling them. If they are in the basement shop it's gonna take an Indiana Jones effort to find them.

    All we need to do is put a few pair on ebay and rig the bidding up to 1000 or so to "announce" that they are candidates for cloning.

    And while you're at it, those pesky lens too....

    sub
    Pure genius.

  10. #10
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    I just fix a pair of 2405's that were damaged in shipping and replaced the diaphragms. I could easily duplicate the aluminum plugs and make them from any plastic people wanted. I really don't want to take my 2405's back apart if someone has a extra aluminum plug they can sell me I will start making them.

    http://integrexmachinist.com/PicWeek.../MillTurn2.mpg

  11. #11
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    Quote Originally Posted by edgewound View Post
    I bet there's a shop somewhere in China that could knock out 10,000/day
    Uh Huh.

    And most likely for pennies per unit.

  12. #12
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by subwoof View Post
    There was a guy who sold clones somewhere in the mid-atlantic region...
    Yep. He was selling them on ebay for $80 a pair and claimed "that people thought his clones sounded even better than the original." Yeah, right.

    I bought the pair of originals that he used to make his copies from. He charged me $80 for the pair and I was happy to pay it for a pair of original JBLs. Unless the copier had quite a pedigree, I doubt I'd pay for a pair of copies. As has been pointed out above, the tolerances are just too critical and I am not into horseshoes when it comes to my audio.

    I haven't seen him on ebay in years.


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    Can you buy the aluminum phase plugs from JBL?

  14. #14
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Integrexman View Post
    Can you buy the aluminum phase plugs from JBL?
    A few years ago you could still get them, but recently I was told that they are NLA.

    Most of the interesting JBL stuff is NLA... well except for some new stuff that is NRA (Not Really Available)


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