My incredible 771

Discussion in 'Exclusively Sansui' started by RMS 330, Sep 15, 2018 at 8:22 PM.

  1. RMS 330

    RMS 330 New Member

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    42
    I posted my recent experience in this thread.
    http://audiokarma.org/forums/index.php?threads/some-sansui-praise.836968/#post-11964198
    I have never owned a Sansui till a couple days ago ($75 CL). I cannot believe the incredible sound I hear. Soo sweet to my ears. I am told this is just the way Sansui receivers sound. If so I will be a Technics convert.
    My new/old 771 looks great, but has some problems I am hoping some of you can help me clear up.
    There is a low hum thru the speakers with volume off as well as some speratic popping noises (occasionally loud ones). The popping also can happen during normal playing volume. I have only used a TT so far. The tuner section does not function but I rarely use that anyhow.
    I do not want to use better speakers or use it at all until I know what the underlying problem is.
    I am no technician, but hope resolve the issues in house. I will open it up and post some pics. Any thoughts would be greatly appreciated.
    IMG_20180914_230014.jpg IMG_20180914_230200.jpg IMG_20180914_230223.jpg
     
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  2. avionic

    avionic " Black Knights " Subscriber

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    Looks sharp..
     
  3. RMS 330

    RMS 330 New Member

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    IMG_20180915_223106.jpg Not sure what 4 ch adapter means
    IMG_20180915_223125.jpg IMG_20180915_223238(1).jpg IMG_20180915_221715.jpg IMG_20180915_221731.jpg IMG_20180915_221748.jpg IMG_20180915_221804.jpg IMG_20180915_222021.jpg
     

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  4. sansui 74

    sansui 74 Member

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    Location:
    Seattle Wash
    Your 771 my be in need of a recap, lots of helpful people here. Ken
     
  5. RMS 330

    RMS 330 New Member

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    42
    Found this in another thread. Will do this first.

    When I first got my 771 it hummed. Cleaning the connector on the Driver Board (F-1499A) solved the problem for me.

    I had the problem as described by others in this thread: A fairly loud hum when the unit was powered on - present regardless of volume, selector setting, thru speakers or headphones - steady hum and nothing would affect it. I pulled the F-1499 driver board and used Deoxit on the blue connector. Re-assembled and the unit is as quiet as it could possibly be.
     
  6. milo63

    milo63 AK Subscriber Subscriber

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    Love my 881 that the usual suspects walked me through fixing. It's on the bench getting relamped now and I need to have a new face glass cut while it's apart.

    My newly found KR-7600 might be close, I need to do a proper A/B when I get time.
     

     

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  7. RMS 330

    RMS 330 New Member

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    IMG_20180915_222021.jpg
    Is this the F-1499 driver board?
     
  8. milo63

    milo63 AK Subscriber Subscriber

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    That's your driver board, the part number will be on it.
     
  9. RMS 330

    RMS 330 New Member

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  10. jdwk

    jdwk AK Subscriber Subscriber

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    I have heard that receiver, and it is a real sleeper. Receiver guys never mention it, but if the secret gets out it will get expensive.
     
  11. Soundphile

    Soundphile Active Member

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    Location:
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    The random popping noises could well point to failing small value transistors. And together with a good recap job and calibration, this will be a definite keeper.
     

     

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  12. jcpcali

    jcpcali New Member

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    Hey congrats on the 771. I also picked one up a year ago and love it, which brings me to a question. If this isnt the proper forum please point me in the right direction. In addition to the 771 I also have a qrx 7001. I have an opportunity to pick up klh model 20s, which I believe are 4 ohm. Im a zero when it comes to impedence matching. Can I use these 20s with bith the 771 and 7001. I have some large advents Id like to pair with for the quad pissibly but most likely with the 771. I’m getting into vintage after raising my kids and focussing on their interests (video games). I have a bunch of tube consoles in various stages if restoration, also a fusher 500c in need of recap. Im a daily lurker simply because whatever I google there has always been existing info posted. I love this site and appreciate all of the knowledge you experts share.
     

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