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  1. R

    A Sansui engineer's account of Sansui history and a continuation of Sansui's legacy

    Here's some links on the birth of DC amplifiers. https://ishinolab.net/modules/doc_serial/audio_history_japan/serial001_006.html https://ishinolab.net/modules/doc_serial/audio_history_japan/serial001_015.html https://ishinolab.net/modules/doc_serial/audio_history_japan/serial001_020.html
  2. R

    Show Me Your Sansui!

    This is 'Jim Showker'. He's helped quite a few on this forum with restores. I had a 999 & 9500 redone. Great work and fantastic service.
  3. R

    A Sansui engineer's account of Sansui history and a continuation of Sansui's legacy

    That's fantastic. Its taken me a long time to get working with a complete recap, FET change and bias adjustment.
  4. R

    A Sansui engineer's account of Sansui history and a continuation of Sansui's legacy

    There's some amazing stuff in the link. A Sansui fans 'wet-dream'. This is two links on 'X balance' and x07 series amplifiers. Nice read. https://ishinolab.net/modules/doc_serial/audio_history_japan/serial001_035.html https://ishinolab.net/modules/doc_serial/audio_history_japan/serial001_036.html
  5. R

    SANSUI AU-D907x Decade

    Better late than never. I got the amp seven years since starting this thread. All caps were replaced and the FETs discussed here. Used two SK170 paralleled and blah ! Before that the settings could not be adjusted and the amp would go into protection after a few hours of use. It got crazy hot...
  6. R

    Altec 9849-8A help

    I know it is an old thread but this chap at the hifihaven site measured his 9849 crossover and posted the elusive coil numbers. Hope this helps. https://hifihaven.org/index.php?threads/altec-2-way-build-ala-jelabs-802-32-414.3452/page-7
  7. R

    Sad News

    R.I.P Jim. Thanks for the 9500 which wouldn't have happened without your help,
  8. R

    Marantz 3200 Preamp restore help

    Thanks. I kinda found out late, that film was ok till about 4.7/6.8.
  9. R

    Marantz 3200 Preamp restore help

    Thanks Mike. I'm going with FGs for the 3.3 and looking to buy 6.8s as well. Will stick with the original spec.
  10. R

    Marantz 3200 Preamp restore help

    Dear gurus. Please help.
  11. R

    Marantz 3200 Preamp restore help

    Hi, I'm putting together a cap list based on the experience here. On the pre/tone amp board the manual shows CE05/06 is 6.8uF@35v and CE11/12 is 3.3uF@50v. I have 4.7uF (FG) caps in plenty. Can I use this at these locations instead of the original spec. Schematic attached. I'm hoping somebody...
  12. R

    Musical Fidelity TRIVISTA

    Can somebody please help identify this selector switch.
  13. R

    Musical Fidelity TRIVISTA

    Trying to restore a broken unit and the source selector switch is the culprit. It is open with no continuity. The model is a motorized unit. Where can I source a unit or replacement ?
  14. R

    SANSUI AU-D907x Decade

    Thanks Ronald. Super work.
  15. R

    Speaker recommendations for Sansui au-x701 Amplifier?

    Used them on DIY - bookshelves and towers with 88 and 91dB sensitivity. Plays just fine with no shortage of power or dynamics. Currently, they're hooked up to Altecs.
  16. R

    SANSUI AU-D907x Decade

    For the UPA68h, any experience with this seller ? Reliable ? Seems unusually low@ 5 pieces for $5.12. http://www.ebay.ca/itm/5pcs-UPA68H-UPA68-ZIP-7-/180861578712
  17. R

    SANSUI AU-D907x Decade

    Thanks Angus. Will wait for your return.
  18. R

    Sansui Restorer?

    Jim Showker is top notch. He's done a few of my units and there are no regrets. I don't live in the US, he completed the job and shipped overseas.
  19. R

    SANSUI AU-D907x Decade

    Thanks Angus. Going with the spec in the D11 manual, SANSUI state 2SK389 (BL or V), but NICO only stocks GR, which is the lowest value. Is this important ?
  20. R

    SANSUI AU-D907x Decade

    Can I go with LDSS@6-12. They are a lot cheaper than 2.6-6.5 and available from diyaudio.com. Any other sources recommended ?
  21. R

    SANSUI AU-D907x Decade

    Can somebody please help answer this.
  22. R

    SANSUI AU-D907x Decade

    A little confused here while choosing the SK170 devices to use in pairs replacing the SK389s. How do I choose the LDSS value ? There appears to be more than one grade of the same device. Please help. Grade A (Idss 2.6 - 6.5) Grade B (Idss 6 - 12) Grade C (Idss 10 - 20) Grade D (Idss 18 - 30)
  23. R

    SANSUI AU-D907x Decade

    Good on you Ronald. Maybe mail it to the personal IDs, if interested. I'm first in line...:D
  24. R

    SANSUI AU-D907x Decade

    To start with, the plan is to replace the UPA68h with originals and the 2SK389 with dual SK170s. Is this ok ?
  25. R

    SANSUI AU-D907x Decade

    Strangely enough, could not find the F-4298 used in other models. Do you know where else it might be used. The main FETs appear to be UPA68h and 2SK389.
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