What SDA 2Bs' are these?

audiobilly
audiobilly Posts: 351
edited September 2010 in Vintage Speakers
Greetings to all who stopped by!:)

I have come up with a pair of SDA 2 speakers, I think they are 2Bs'. I am trying to determine what version of SDA 2Bs' these are, and what year, 1987 or 1989. These have the pin/blade IC, SL2000 tweeter, and the typical 2 drivers and 1 12" PR. These do not have the end caps.

According to the schematics, the drivers part#'s are the same in the 87 and 89 versions. The schematics do not show a part# for tweeter in the 87 version, but do reference a SL2000 in the 89 version. All in all the 89 version of the schematics looks to be the same as the 87 version, just a better drawing, I am still looking at this to see if there is indeed a "noted" difference.

What am I missing?

Thanks Gang.
Post edited by audiobilly on
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Comments

  • MillerLiteScott
    MillerLiteScott Posts: 2,561
    edited September 2010
    Sounds like Studio 2B's.
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D
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  • george daniel
    george daniel Posts: 12,096
    edited September 2010
    another vote for 2B studio version
    JC approves....he told me so. (F-1 nut)
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  • audiobilly
    audiobilly Posts: 351
    edited September 2010
    OK, we can confirm the 2B version part, for the most part. Now what version 2B are they. If you look up the schematics, there are 2, 2Bs' after the BB (blade blade) version, if I am reading correctly. I am trying to find the correct schematic, so I can rebuild them. These guys are at work, so I will pull the drivers to see if they can tell me anything different to what I am reading in the schematics.

    What da ya think Gang?

    And thanks for the replies Scott and george
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  • Hamatym
    Hamatym Posts: 269
    edited September 2010
    Pull out the driver's and see what they are....2B's will be (1) MW6503 & (1) MW6511 If you have those, then you have 2b"s
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  • gimpod
    gimpod Posts: 1,793
    edited September 2010
    audiobilly wrote: »
    OK, we can confirm the 2B version part, for the most part. Now what version 2B are they. If you look up the schematics, there are 2, 2Bs' after the BB (blade blade) version, if I am reading correctly. I am trying to find the correct schematic, so I can rebuild them. These guys are at work, so I will pull the drivers to see if they can tell me anything different to what I am reading in the schematics.

    What da ya think Gang?

    And thanks for the replies Scott and george

    If there 2B's, as far as the crossovers go there the same one for all 3 versions.
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • F1nut
    F1nut Posts: 50,761
    edited September 2010
    Pull one of the crossovers, all the values are printed on the caps and resistors.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • audiobilly
    audiobilly Posts: 351
    edited September 2010
    Thanks for the replies Hamatym, gim54pod and F1 nut.

    I can not find any difference from the 87 and 89 versions of the schematics, just looks like a better drawing. This looks like what I have. Like F1 says pull it apart and see what it is. I like to have an overview of "what" to expect before going in. So I am just trying to get my ducks in row.

    Thanks gang!!!
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  • heiney9
    heiney9 Posts: 25,217
    edited September 2010
    audiobilly wrote: »
    Thanks for the replies Hamatym, gim54pod and F1 nut.

    I can not find any difference from the 87 and 89 versions of the schematics, just looks like a better drawing. This looks like what I have. Like F1 says pull it apart and see what it is. I like to have an overview of "what" to expect before going in. So I am just trying to get my ducks in row.

    Thanks gang!!!

    87 has blade/blade; 89 has pin/blade and an improved polyswitch other wise the x-over is exactly the same. The best way to tell is by the driver model numbers 2B's have MW6511 for the dimensional driver and MW6503 for the stereo driver.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • audiobilly
    audiobilly Posts: 351
    edited September 2010
    Thanks for the input H9!

    All in all, the only difference in the "87 pb" drawing and the "89" drawing is the polyswitch update.
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