Yamaha MX-1 Thread

Discussion in 'Yamaha' started by Bratwurst7s, May 18, 2018.

  1. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    Munich, Germany
    Thanks guys!

    Oh. Something that I forgot to mention. The holes where the mounting screws to attach the amp board heat sink rail to the main heat sink measured at 2.5mm, which is the correct hole dia to tap them for M3 machine screws if someone wants to do that job really correctly. But I didn't want to be doing any thread cutting without completely dismounting the rail, hence using sheet-metal screws like Yamaha did.

    Cheers,
    James
     
    Last edited: Jul 15, 2018

     

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  2. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
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    One last small observation. Before I went in and recapped this unit I noticed that it seemed to be running fairly hot after an hour or so of use with moderate volume levels.

    Now that the amp board heat sink rails are more securely attached to the main heat sinks the amp only gets lightly warm even after several hours of spirited use.

    So for anyone else with one of these amps it may pay to check how securely the amp boards are attached to the heat sinks.

    Cheers,
    James
     
  3. bmanone

    bmanone Active Member

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    Location:
    Calico Rock, Arkansas
    Very nice work and great photography. Thanks for the guide!
     
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  4. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    Thanks, and you're welcome! :)

    It's a good thing that the camera knows what to do because otherwise I'd be lost. ;)

    Cheers,
    James
     
  5. Bastian

    Bastian New Member

    Messages:
    20
    Interesting Thread! Thank you so much for the information and follow up on this restoration. I just scored one MX-1 myself!!! Although mine was $750 US... but hey! that's just hard to beat with any other offer. Just one question, reading this I see you commented on most (if not all) parts you replaced by codes. That's very helpful. I wonder if those parts you replaced would be the only ones I should have replaced to get a complete overhaul, for what matters the most, done? If so, I'll get the schematics and probably recap it this coming winter.

    I'll test mine, but if it's in full working order I won't bother restoring until I have some time.
     
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  6. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    Hi Bastian,

    The only parts that I didn't replace for a complete servicing that should still be done are the relays and the main filter caps.

    Concerning the relays, I still haven't researched what to use. Most likely Mouser has something, I just haven't looked at that issue yet.
    And concerning the main filter caps, I haven't found something in the right capacity & voltage that fits.

    You are going to like your MX-1. It's a nice clean sounding amp. :thumbsup:

    Cheers,
    James
     

     

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