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"Loose" McIntosh black rocker switches: can these be tightened or retensioned?

Discussion in 'McIntosh Audio' started by monkboughtlunch, May 6, 2017.

  1. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Regarding the black vertical rocker switches that McIntosh used on units like: MX-110, C22, MA5100 etc, can these be tightened up if they have become "loose" or the "friction" has dissipated over time?

    rocker.jpg
     

     

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  2. dewickt

    dewickt Will fix about Anything

    Messages:
    3,399
    Location:
    Knoxville, TN
    The foam backing has deteriorated on the back side of the rocker, this is what firms up the switch.
     
    monkboughtlunch likes this.
  3. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Thanks Terry! Can the switch be easily repaired with new foam?
     
  4. dewickt

    dewickt Will fix about Anything

    Messages:
    3,399
    Location:
    Knoxville, TN
    The repair is not to hard, its finding the right foam that is hard.
     
  5. marantzfan

    marantzfan ... Subscriber

    Messages:
    8,057
    Location:
    Peoria, Arizona
    So, does anyone know which foam is appropriate here? I've got the same situation with my MX110.

    Almost looks like weather stripping closed cell foam pieces...?
     
    monkboughtlunch likes this.
  6. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    I'd like to know as well. Anyone found the correct foam? Paging Terry....
     

     

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  7. dshoaf

    dshoaf That high voltage buzz Subscriber

    Messages:
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    That's what I used - from the Home Despot, too. Difficult to get installed once you pull the backing off the sticky part, tho.

    Be sure to get all the old stuff that's turned to powder out first.

    Cheers,

    David
     
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  8. marantzfan

    marantzfan ... Subscriber

    Messages:
    8,057
    Location:
    Peoria, Arizona
    Did you disassemble the switch somehow? Seems very tedious to just get the old foams out without disassembly.
     
  9. Destructor

    Destructor Super Member

    Messages:
    1,526
    Location:
    Braintree, Mass
    The rocker switches on the faceplate aren’t switches, they engage slide switches attached to the chassis. Remove the face plate and you have access to the rockers. I removed all the foam from my 110 and my 230, I just live with the loose feel.
     
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  10. jlovda

    jlovda Things I loved from the 60's and 70's Subscriber

    Messages:
    3,479
    Location:
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    What switch technique did Mac use for the switches on the more recent commemorative edition of the C22 as compared to 50 yr old models like the original C22, MA230, MX110, etc?
     
    monkboughtlunch likes this.
  11. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Did you take pictures? And can you provide a link or part number for the correct weather stripping product? Thanks!
     

     

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  12. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Hi Terry, what foam do you recommend using?
     
  13. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Bump. Anyone have pics and link to the foam product?
     
  14. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    I installed some festoon LEDs in my MX110. Since I've taken the faceplate off, I thought now is a good time to see if I can address the notorious McIntosh foam disintegration issue.

    First off, the foam issue is not just a tactile problem. I'm actually experiencing some static and drop outs from one of the switches. I want to rid it of the rotted crumbling foam before I hit it with DeOxit.

    See photos below. I've heard the mechanism is just a slider switch with a plastic rocker over the top. Is that correct?

    Does anyone know how to remove the plastic rocker cover in order remove all the crumbling foam debris? I'd like to get those rockers off, clean the foam out and they spray some DeOxit or Faderlube on the switches. Then add new foam, reinstall the rocker and button it back up.

    Has anyone tackled this process before? If someone has already developed a process to address this it needs to be a sticky!


    IMG_6206.jpg

    IMG_6205.jpg

    IMG_6207.jpg
     
  15. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    More photos.

    Has anyone taken the rocker cover off the switch? If so, what is the process?

    Are the yellow strips shown below the backing for the rotted foam, and if so, can they be pulled out without disassembling the switch? To get new foam in, does the rocker need to be taken apart?

    IMG_6230.jpg

    IMG_6229.jpg

    IMG_6228.jpg

    IMG_6223.jpg
     
  16. marantzfan

    marantzfan ... Subscriber

    Messages:
    8,057
    Location:
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    This must be a highly guarded secret. I've asked around several times and... Nothing.

    Surely someone knows as I've heard of it being done.
     
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  17. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Agreed! The C11, C22, MX110, MA230 and MA5100 all use these same rocker switches. After 50 years, the foam will have disintegrated in every single surviving unit (unless restored) of these models. Given the ubiquity of this crumbling foam problem, there are certainly people who know how to make this repair.

    It's not clear if the pins can be removed to allow the rocker cover to be taken off. It's also not clear if those strips can be pulled out with the rockers in place.
     
  18. 62caddy

    62caddy Trust but verify Subscriber

    Messages:
    9,592
    Location:
    NEPA
    Audio Classics replaced the foam on mine. Check with them for the materials needed.
     
  19. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Thanks for the tip. I'll look into it. In the meantime, if anyone has any experience or tips on how to do this, please post here.

    I wonder if this Frost King material could be custom trimmed and used for the rockers.

    51hSjOlJB9L.jpg
     
  20. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,813
    Bump. Anyone?
     

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