Help Identifying Component Values on early 3.1TL crossover (BE0031-A)

lawdogg
lawdogg Posts: 455
edited June 2016 in Vintage Speakers
In addition to having the 2ohm resistor discussed here (http://forum.polkaudio.com/discussion/166927/sda-srs-3-1tl-driver-phase/p1), my early 3.1TLs seem to have an extra capacitor in the tweeter circuit, as you can see here (note two electrolytics are glued to the big 12uF mylar):

IMG_20150412_184024157.jpg

Hidden from view here, pic showing the crossover label:

IMG_20150412_174532597.jpg

That extra cap doesn't seem to be present or discussed in other threads I've dug up, e.g.:

http://forum.polkaudio.com/discussion/47929/rebuilding-3-1tls-crossovers

But in this thread, also early 3.1TLs given the resistor, they are present but not discussed:

http://forum.polkaudio.com/discussion/106099/3-1tls-before-and-after/p1

My hunch is that they are a pair of 12uF electrolytics that combine to make the 24uF shunt cap value for the stereo driver circuit.

Thanks in advance!

Ryan
<3 my 3.1TLs

I will fix your shifted magnets for free. :)
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Comments

  • voltz
    voltz Posts: 5,384
    that would be my guess, but dang if that 2 ohm didnt show up again. hopefully Tony and or the others can help you.

    have you seen this interactive layout of Tony's board? just move your mouse over each spot will show you what should be there.
    http://www.gimpod.com/partsp31tl.html
    2 ch- Polk CRS+ * Vincent SA-31MK Preamp * Vincent Sp-331 Amp * Marantz SA8005 SACD * Project Xperience Classic TT * Sumiko Blue Point #2 MC cartridge

    HT - Polk 703's * NAD T-758 * Adcom 5503 * Oppo 103 * Samsung 60" series 8 LCD
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  • lawdogg
    lawdogg Posts: 455
    Oh that's fantastic, thank you. Very helpful tool, that's super slick, nice @gimpod !

    Seems a viable option will be to use a 24uF Sonicap instead of parallel 12uF caps, but I wonder if anyone has used parallel 12uFs instead and what result.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • txcoastal1
    txcoastal1 Posts: 13,283
    I've been to Tony website before didn't realize the interactive layout...very nice
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

    erat interfectorem cesar et **** dictatorem dicere a
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  • westmassguy
    westmassguy Posts: 6,850
    lawdogg wrote: »
    Oh that's fantastic, thank you. Very helpful tool, that's super slick, nice @gimpod !

    Seems a viable option will be to use a 24uF Sonicap instead of parallel 12uF caps, but I wonder if anyone has used parallel 12uFs instead and what result.
    The result would be less money in your wallet. Other than that, no difference.
    You will have to be creative fitting everything on the original boards.
    Tony's, (@gimpod) boards are a lot easier to work with.8zjgak58hse6.jpg


    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • stogie
    stogie Posts: 230
    @westmassguy it's hard to tell from the picture, but do you have two resistors in the B & G connections?
    Speakers: Polk SDA-SRS xovers rebuilt by David, RDO194's, Dynamat, BH5, glued magnets, new cloth, custom aluminum terminal plates with Cardas posts and Speakon interconnect
    Speaker Cables, Jumpers & Interconnect: DIY Douglas Connection
    Power Amp: Sunfire Architect's Choice Series II
    Preamp: Adcom GFP-750
    SACD/CD: Oppo BDP-95
    Tuner: Sansui TU-717
    TT: Technics SL-MA1
    Phono Pre: Emotiva XPS-1
    Music Server: Mac Mini w/JRiver - iPad w/JRemote
    DAC: Eastern Electric MiniMax Plus
    Other Polks: SDA: 1A, 1C, 2B, CRS+ / Monitor: 10A, 5jr, 4 / RT5
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  • westmassguy
    westmassguy Posts: 6,850
    Yes, a .62 ohm and .68 ohm in series.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • stogie
    stogie Posts: 230
    thank you David
    Speakers: Polk SDA-SRS xovers rebuilt by David, RDO194's, Dynamat, BH5, glued magnets, new cloth, custom aluminum terminal plates with Cardas posts and Speakon interconnect
    Speaker Cables, Jumpers & Interconnect: DIY Douglas Connection
    Power Amp: Sunfire Architect's Choice Series II
    Preamp: Adcom GFP-750
    SACD/CD: Oppo BDP-95
    Tuner: Sansui TU-717
    TT: Technics SL-MA1
    Phono Pre: Emotiva XPS-1
    Music Server: Mac Mini w/JRiver - iPad w/JRemote
    DAC: Eastern Electric MiniMax Plus
    Other Polks: SDA: 1A, 1C, 2B, CRS+ / Monitor: 10A, 5jr, 4 / RT5
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