Yamaha MX-35

Discussion in 'Yamaha' started by dino74, Jan 10, 2019.

  1. dino74

    dino74 AK Subscriber Subscriber

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    I'm using two MX-35s to Bi-amp the Linn Tukans in my bedroom. I also have an extra 35, so I decide to recap it.

    I got a paper copy of the MX-35 SM and made some PDFs from them. The design seems to be the same as the M-35 but I think these PDFs are better quality.

    http://akdatabase.com/AKview/albums/userpics/10007/Yamaha MX-35 Schematic.pdf
    http://akdatabase.com/AKview/albums/userpics/10007/Yamaha MX-35 Service Manual.pdf

    I'm trying to figure out if these are the correct Nichicon capacitors to use.
    ES for C103
    KZ for 107, 119
    PW for 123,121

    Screenshot from 2019-01-10 18-40-32.png
     

     

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  2. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    The C103/104 are easy, signal path coupling/DC-blockers. Personally I would use Wima MKS2 film caps there but if not then for sure ES BP.
    https://www.mouser.de/ProductDetail...=sGAEpiMZZMv1cc3ydrPrF7l45uRd9dVhvGS3cHOkNOA=

    C121/122 and C123/124 look like de-coupling caps (or/and local filtering?) on the supply lines for the STK's? (+V=9 & 10, -V=6 & 7?) if so then the PW look like a good choice.

    C107/108, C119/120, I'm not experienced enough to call their functions (de-coupling in filters & anti-distortion feedback loops?) but would think that KZ would work fine there. I'd up that 100µF/6.3v to 10v or 16v.

    Wish that I could be more helpful, perhaps Avionic or mbz etc will drop by and have better thoughts.

    Cheers,
    James
     
  3. dino74

    dino74 AK Subscriber Subscriber

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    Brat, thanks for your input. I'll take your word and try out the Wima MKS2 .

    Seems like there are two type of caps in this box. Rubycon CEW for coupling and unknown marked AU for decoupling.
    IMG_0498.jpeg

    Since I only use this in 2 channel mode and not four, I'm going to swap out the push terminals for plug terminals
    IMG_0501.jpeg IMG_0503.jpeg
     
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  4. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    That little triangle thingy on the dark blue cap means that it is a Matsushita aka Panasonic.

    I tend to really like Panasonic FC and FM caps. 105° temp rating, low ESR, relatively high ripple rating compared to other caps with the same capacity and long life. The FC is a good all rounder and the FM have even lower ESR and longer hour rating but less selection for capacity. Iirc they tend to be less expensive than Nichicon also.

    After reading a lot of posts by ConradH and other people that I've learned to respect I've come around to replacing all small capacity electrolytic caps with Wima MKS2 or Panasonic film caps unless they won't fit or it gets too expensive. The 10µF MKS2 are a bit large and won't fit everywhere as well as being fairly expensive so I tend to use them only where it really counts (like signal path) but pretty much everything 6.8µF and smaller gets film caps.

    Nice binding posts. :thumbsup: I like those type a lot and use them pretty much everywhere (speakers also).

    Cheers,
    James
     
  5. dino74

    dino74 AK Subscriber Subscriber

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    I went with the FMs where I could and will use the MKS for the signal path. Thanks for the input Brat!

    $30 of parts for a $20 amp o_O
     
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  6. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    Happy to be of use.

    Yeah, I kinda did the same thing with my AX-300. I think that it only cost me something like €15 and I probably spent double that upgrading it. But it's pretty well built for a simple little 30w amp and sounds sweet with a pair of Canton GL 260 speakers.

    Cheers,
    James
     

     

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  7. amr2

    amr2 Well-Known Member

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    I like Panasonic FC/FM, good all rounders IMHO
     
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  8. dino74

    dino74 AK Subscriber Subscriber

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    Almost made a dumb mistake. I decided to bump up the main caps to the next size but didn't see if it would fit but luckily it clears the lid by a couple of millimeters.
    IMG_0508.jpeg
     
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  9. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    Well, it looks like you got that one nailed. :D

    But in any case, a couple of mm is as good as a km as long as it fits. I can't quite see in the photo, what caps did you use there?

    Cheers,
    James
     
  10. dino74

    dino74 AK Subscriber Subscriber

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    Cornell Dubilier Electronics LX was the only one with 4 lead snap in.
     
  11. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    For future reference: United Chemicon KMH come in a 5-pin config. (You have to cross reference the data sheet & P/N's, there are several different pin configs.) The 5th pin can be snipped off and the rest slightly bent in towards the center and then they are a drop-in fit.

    I haven't used Cornell Dubilier yet but Avionic says good things about them so I assume that they are of good quality. I'll have to make a note about that pin config for my own future reference.

    Cheers,
    James

    ps: I'm dying to know. What were the nails for?
     

     

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  12. dino74

    dino74 AK Subscriber Subscriber

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    Thanks James! Thanks a good to know about the 5 pin. LOL at the nails. I made the speakers terminals at my parent's house using my dad's table saw to cut the plastic mounting plate. I also need some nails to hang various junk in the garage so I grabbed a bunch from his nails can and put them in the amp.
     
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