SDA-1c or original SRS-2 for 2ch stereo??

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  • inspiredsports
    inspiredsports Posts: 5,502
    edited March 2010
    I don't know if everyone knows about the "Sticky" thread in the Vintage Speakers section at . . .

    http://www.polkaudio.com/forums/showthread.php?t=55888

    You need a free Adobe Acrobat reader to open these .pdf files, but nearly everyone should have it by now. Scroll down the page, find the models you are interested in and print a copy (they all print on a single 8.5X11" sheet).

    These schematics make it easy to see what speakers are similarly designed.

    The "SDA CRS+ 1990 SL3000 Mod Sch.pdf" shows the "Classic" TL mod.

    Other Schematics that compare similarly (SDA-2B, SDA-2A, SDA-1B, 1986 SDA SRS 2) allow you to insert a 5.8uf bypass cap and convert to RDO-198's.
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
    Conrad Johnson PV-5 w/mods
    TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
    Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
    Tuners w/mods Kenwood KT5020 / Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
    PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
    Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels
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  • Backtothe80s
    Backtothe80s Posts: 45
    edited March 2010
    Thanks a bunch, Inspired. I'll e-mail you.
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  • inspiredsports
    inspiredsports Posts: 5,502
    edited March 2010
    gdb wrote: »
    . . . I hope that a method for "TL'ing" the pin/blade (1987 SDA SRS 2) models can be worked out someday!

    I have been studying the schematic for the 1987 pin/blade SDA SRS 2 (and also the similar schematic for the SDA-1C) and have noticed both utilize a 4.4uf cap.

    I'm not well versed enough to have a clear insight as to what this 4.4 cap contributes, but wonder if its purpose is similar to what the 4.4 cap does in the 1986 SDA SRS 2 circuit. It's not in the same position in the circuit, but I'm curious if it could be as simple as replacing the 4.4 with a 5.8uf to allow for the use of RDO-198's.

    Can any members with more experience weigh in on this?
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
    Conrad Johnson PV-5 w/mods
    TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
    Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
    Tuners w/mods Kenwood KT5020 / Fisher KM60
    MF x-DAC V8, HAInfo NG27
    Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
    PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
    Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
    NAD SS rigs w/mods
    GIK panels
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  • davis419b
    davis419b Posts: 61
    edited March 2010
    RuSsMaN wrote: »
    Signature Reference Series, period.

    My favorite SDA, the SRS 2.

    I have a chance to buy a set of srs-sda,s but I am not familiar with them. I am a big Klipsch fan but I would like to try a set of these. Can these be compared to Klipschorns ? By the way Russman , what part of N.Texas are you from ?
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