Just picked up a B-2x/C-2x combo.

Discussion in 'Yamaha' started by dino74, May 31, 2018.

  1. dino74

    dino74 New Member

    Messages:
    21
    Location:
    Oceanside, CA
    Wasn't looking for it but happened to come across it and talked him down to $500. Not sure yet how I'm going to use them. Any quick preventative maintenance tips?
     

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  2. zaibatsu

    zaibatsu Well-Known Member

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    570
    Both should be inspected corrosive glue used to hold some caps down (can absorb moisture and short things out over the years), and bad solder joints retouched with fresh solder. This is especially wise on the "Class A" area of the B-2x power amp boards which have a series of TO-220 transistors which run very hot. It's good to clean and redo the thermal paste at the same time.

    Unfortunately it's not a quick or small job, it's either quite time consuming, or a little expensive for someone to do the job properly - however it would be well worth it for those excellent and valuable pieces you've purchased. While there's always a risk of failure if the pieces are used unrestored, if they were sold as functioning, maybe it's not a bad idea to take the small risk (if you're comfortable with that) and listen to them first to decide if you can justify the time / expense in restoring them. Once restored (correctly, by the right person) they will easily endure another 30+ years of regular use.

    If you ask anyone here I'm sure they'll agree those pieces are certainly worth it.
    Searching and reading through this forum will give you most information you need, if you wish to tackle the project yourself. The important tool you'll need in that case is patience.

    A nice gallery here of a restored one:
    https://www.flickr.com/photos/77313494@N03/sets/72157633401219486

    Welcome to AK and congratulations on your purchase!
     
  3. avionic

    avionic " Black Knights " Subscriber

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    :rolleyes:
    What a deal..

    Welcome to AK dino
     
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  4. bmanone

    bmanone Active Member

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    121
    Location:
    Calico Rock, Arkansas
    I can vouch for the B-2X, it is worth the effort. Mine didn't have the glue problem, but the 100,000 uF capacitors on the amp boards were toast. Enjoy your new (to you) TOTL Yamaha components!
     
  5. Vint Age

    Vint Age B-1 With Yamaha

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    DITO that! :thumbsup:
     
  6. dino74

    dino74 New Member

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    Location:
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    @zaibatsu, thanks for the info! I plugged in the B2-X last night and played some music. It sounded good but I couldn't play it loud.... neighbors.
    Based on what you said, I'll put both units on the side and slowly restore them as I have time.

    The seller knew they were good quality but I don't think he knew they were TOTL for its time. Either way, he was happy they were going to someone who'd appreciate them.
     

     

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  7. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

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    The look like they were well cared for. Nice purchase. Enjoy them and welcome to AK. :)

    Cheers,
    James
     
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  8. Mr. Yamaha

    Mr. Yamaha Not so much Yamaha lately... Subscriber

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    Wow, that is a massive score indeed. They look minty too :bigok:
     
  9. OMGCat!

    OMGCat! AK Subscriber Subscriber

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    Great score there for sure. Welcome to AK!

    I'd inspect both for weak caps and bad solder joints. My C-2x has lots of cracked joints and the way the boards are positioned pretty much cooks the caps to death.
    I haven't been in my B-2x so I'll defer to the advice above.
     
  10. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

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    I’ve owned two C-2x preamps. A very, very fine preamp! My first one needed some work as several of the RCA connections to the PCB were loose. It had also been recapped by the previous owner who had Ecowars do the work. The second one I still own and it is 100% original and works perfect. As long as it keeps performing like it does, I don’t plan on touching it.

    You stole those units. Easily worth $1500 to $2000 maybe more.
     
    Last edited: Jun 1, 2018
  11. dino74

    dino74 New Member

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    Just took a quick peek .... Nice protective layer of dust!
     

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  12. avionic

    avionic " Black Knights " Subscriber

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    You could grow potatoes in there.:D
     
  13. bmanone

    bmanone Active Member

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    121
    Location:
    Calico Rock, Arkansas
    I bet that cover has never been off before!
     
  14. 808_state

    808_state Well-Known Member

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    512
    No kidding!

    Congratulations to the OP on a truly dynamic sounding duo. Stunning clarity is in your immediate future!
     
  15. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

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    Well at least you know it is original! C-2x similar inside? A little more difficult for dust to accumulate inside a C-2x with no vents on top.
     
  16. dino74

    dino74 New Member

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    Haven't check the C2-x yet .... had to travel for work
     

     

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  17. OMGCat!

    OMGCat! AK Subscriber Subscriber

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    I doubt any dust will be in there. That is pretty sealed up unit with half of the components covered again under their own red plastic covers.
     
  18. Dr. Ear

    Dr. Ear Well-Known Member

    Messages:
    699
    Location:
    Austria
    Congrats! The chances are rather high that the solder connections of the power transistors (TO220?) in the Class A stage are open. You might not notice this immediately as they just send an inverse distortion correction signal to the negative outputs.
     
  19. dino74

    dino74 New Member

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    21
    Location:
    Oceanside, CA
    Good to know!
     
  20. 808_state

    808_state Well-Known Member

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    Peter Szumilo...he did my C-2x and it sounds amazing. He does superior work.
     

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