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Kenwood 700C Volume Pot issues

Discussion in 'Kenwood-Trio/Kensonic-Accuphase' started by Raccoon1400, Aug 11, 2017.

  1. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
    Location:
    Ottawa, Canada
    This 700C keeps cutting out, one channel in particular. It seems to be not the volume control its self, but the connection between the solder tabs and the traces on the pot? If I wiggle the wires/tabs just right the sound cuts back in but I can't seem to make it reliable. Any ideas?
     

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  2. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
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    Might need a replacement pot, but it has to be a good one. Original is 20K stepped attenuator with a nice solid feel. With loudness taper. Smooth shaft. Any ideas?

    This is an Echowars restored unit, one of his earlier ones I believe.
     
  3. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
    Location:
    Ottawa, Canada
    I'm still having trouble with this part, I don't know what to do.
     
  4. gort69

    gort69 AK Subscriber Subscriber

    Messages:
    1,090
    Location:
    Vancouver, WA
    That doesn't look like an original pot for that. If you can get a part number off of it you might be able to locate another. An original just sold on the bay (not mine) a month or so back

    s-l1600.jpg
     
  5. Raccoon1400

    Raccoon1400 Super Member

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    I wish I'd have seen that when it was for sale. I have a 700C too, it has a pot that looks like that one.
     
  6. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
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    Last edited: Feb 22, 2018

     

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  7. rjsalvi

    rjsalvi Well-Known Member

    Messages:
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    Too bad it's not a linear pot, you could solder a 33K resistor across the outside tabs of a 50K pot (parallel resistance) and drop it to close to 20K. Fun and games out of the way, you can use a 50K pot, however there is a potential noise issue ... perhaps only measurable and not audible. If the pot can be taken apart and you feel comfortable enough, repair it. Sounds like a tab broke -- or is breaking -- inside the housing, so perhaps a bit of solder will bring it back to life.
     
  8. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
    Location:
    Ottawa, Canada
  9. rjsalvi

    rjsalvi Well-Known Member

    Messages:
    537
    Location:
    San Diego, CA
    Last edited: Feb 26, 2018
  10. Raccoon1400

    Raccoon1400 Super Member

    Messages:
    2,604
    Location:
    Ottawa, Canada
    I haven't found a good way to fix it so far. It doesn't seem to be a problem inside the pot, it appears to be the connection between the solder tab and the trace. I can poke at the wires and make it cut in and out. It isn't just one tab, seems to be a few of them that are troublesome. I've made it work for a while but the issue keeps coming back.
     
  11. restorer-john

    restorer-john Addicted Member

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  12. cchean

    cchean AK Subscriber Subscriber

    Messages:
    1,384
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    It seems the original pot is unobtanium. ALPS still makes a 50k, 100k and 250k stepped attenuators.

    Does anyone know if it's possible to make some changes and use a different potentiometer???
     

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