Proud New Owner of Yamaha M-40

Discussion in 'Audio Hardware' started by Freebird, Jul 21, 2018.

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  1. Freebird

    Freebird Was 205 pounds, now 215. Thread Starter

    Location:
    Plainfield, IN
    Freebird, Jul 21, 2018
    #1
    Helom, Eigenvector, ThorensSme and 6 others like this.
  2. timind

    timind phorum rezident

    Location:
    A little north of Indy, USA
    Nice amp there @Freebird. And howdy from a fellow Hoosier.

    I may be the first to suggest looking into recapping this amp, but I won't be the last. Unless it's been done already, those electrolytic caps are 30+ years old. If you are handy with a soldering iron, you could do it for less than $50.
     
    timind, Jul 21, 2018
    #2
    Freebird likes this.
  3. KT88

    KT88 Senior Member

    Location:
    Salem, VA - United States of America
    Nice amp. Get it serviced ASAP. If a cap fails, it can wreak havoc in there. I have a C45 preamp here; if you are interested, you can send me a private message. They have nice phono stages in them.
    -Bill
     
    KT88, Jul 21, 2018
    #3
    Freebird likes this.
  4. Freebird

    Freebird Was 205 pounds, now 215. Thread Starter

    Location:
    Plainfield, IN
    Hello fellow Hoosier. Thanks for the advice. Appreciated.

    There are two massive looking capacitors with Yamaha stamped on the top of them. Gold lettering and black casing. I’m assuming you’re talking about those. Picture included.

    [​IMG]

    This particular piece is a beauty. All button and lights functioning. Cosmetic flaws minimal. No noticeable noise from amp when ears are put up to speakers. I’m ecstatic.
     
    Freebird, Jul 21, 2018
    #4
  5. KT88

    KT88 Senior Member

    Location:
    Salem, VA - United States of America
    Probably can't do it for that. I service amps all the time and in a complex design or one with large caps, either way it'll get a bit over that. Heck shipping is often $10+. If you don't have a lot of experience with repairs, it's really worth it to have it done professionally. I have seen, and reworked many items where poor work was done. Good work requires proper tools, skill, and dedication. Of course good parts selections also, but any one of the labor bits missing and it'll not be as it should be.
    -Bill
     
    KT88, Jul 21, 2018
    #5
    Freebird likes this.
  6. KT88

    KT88 Senior Member

    Location:
    Salem, VA - United States of America
    Most likely those are OK. It's all of the rest of them that need to go. It's possible for the main caps to go south also, but less common.
    -Bill
     
    KT88, Jul 21, 2018
    #6
    Freebird likes this.
  7. Freebird

    Freebird Was 205 pounds, now 215. Thread Starter

    Location:
    Plainfield, IN
    [​IMG]
     
    Freebird, Jul 21, 2018
    #7
  8. KT88

    KT88 Senior Member

    Location:
    Salem, VA - United States of America
    I'd not run it in class A mode until you get it recapped. It's a gamble even without it, but when that is engaged, it puts more stress on the components.
    -Bill
     
    KT88, Jul 21, 2018
    #8
    Freebird likes this.
  9. timind

    timind phorum rezident

    Location:
    A little north of Indy, USA
    Quite a few threads over on AudioKarma concerning rehabbing the M40. Interesting reading.
     
    timind, Jul 21, 2018
    #9
    Freebird likes this.
  10. Freebird

    Freebird Was 205 pounds, now 215. Thread Starter

    Location:
    Plainfield, IN
    I’ll take a look. Thanks for the info.
     
    Freebird, Jul 21, 2018
    #10
    timind likes this.
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