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  1. #1
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    Date this 515B?


    Altec Best's Avatar
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    Re: Date this 515B?

    Yes the 604E ended production in 1974 I'm pretty sure.It was no longer available after that when they started phasing in the 604G's with the new Tangerine phase plugs circa 1975..As for the 21184 cones there has been 5 revisions of that cone that I'm aware of but could be more.. 21184-2,3,4,8 AFAIK..
    Last edited by Altec Best; September 9th, 2013 at 10:10 PM.

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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: Date this 515B?

    when they started phasing in the 604G's with the new Tangerine phase plugs circa 1975.
    AFAIK, the majority of 604G's have annular steel phase plugs. The cost cutting plastic plug came along in '76 near the end of 604G's production. Ironically, about exactly the same time period Urei abandoned them because of QC problems. While they weren't cataloged, i'm pretty sure you could get new 604E's into the 2nd half of the 70's. I don't pretend to know if 604E and 604G were produced concurrently or not. But, i suspect they were for at least a short period. They were still offering 605B's and 604G's at the same time in 1974.

    .As for the 21184 cones there has been 5 revisions of that cone that I'm aware of but could be more.. 21184-2,3,4,8 AFAIK..
    I probably shouldn't have used the word "revision" as it implies a change was made. I think the cones are all essentially identical, and those suffix digits indicate manufacturing lots, time periods, and possibly even various suppliers.

    IIRC, it was suggested to me that only the first few were used in production of drivers and cone kits, the remainders were in re-cone kits only.

    It is certainly possible that cradledorf's E was an early one, and was re-coned at some point.
    Last edited by bowtie427ss; September 10th, 2013 at 06:52 AM.
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    Senior Hostboard Member magnarc's Avatar
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    Re: Date this 515B?

    Isn't 21092 the actual VC and former, being separate from the actual cone, which usually is 21184-x

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    Senior Hostboard Member bowtie427ss's Avatar
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    Re: Date this 515B?

    Quote Originally Posted by magnarc View Post
    Isn't 21092 the actual VC and former, being separate from the actual cone, which usually is 21184-x
    Hmmmmmmm, a "full kit" versus just a bare cone?

    Interesting.

    Logical.

    More confusing as the same kit number from different time periods could contain cones of different numbers. Kind of sounds like something Altec would have done.
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  5. #5
    HB Super Moderator
    Date this 515B?


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    Re: Date this 515B?

    AFAIK, the majority of 604G's have annular steel phase plugs. While they weren't cataloged, i'm pretty sure you could get new 604E's into the 2nd half of the 70's.
    As were mine.My 604G's have the annular plugs.. Another change was the new 23744 diaphragm... I'm almost certain that production of the 604E ceased sometime in late 1974 to early 1975.. The production of the units changed significantly from the gray/white color to the gray metallic color.. You could be right though... It would be interesting to see some date codes from some of the 604E units.. That would be the only way to know for sure IMHO, if someone had a unit with a late 70's date code.

  6. #6
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    Date this 515B?


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    Re: Date this 515B?

    Newest E I saw was dated 1976...not sure, but I recall seeing a pair with tangerines, it may have been that pair. We are talking 30 years and many speakers ago....
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    Senior Hostboard Member Cal Weldon's Avatar
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    Re: Date this 515B?

    I heard the end of the G's were the first with the Tangerine.
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