Yamaha B-3 V-fet restoration

Discussion in 'Yamaha' started by vintagejapan, Feb 18, 2018.

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  1. rottalpha

    rottalpha Yamaholic Subscriber

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    Original cans physical size verified to be 63mm x 105 mm
     

     

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  2. rottalpha

    rottalpha Yamaholic Subscriber

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    Technically NO. His unit is in Australia...there are other B-3s closer to you here in North America :bigok:
     
  3. Cosmin2000

    Cosmin2000 Active Member

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    This is the reason I couldn't find a second B3. They all landed in your garage. What's next now?
     
  4. rottalpha

    rottalpha Yamaholic Subscriber

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    lol,

    I left the B1 and the B2 alone in the storage room for a while...then the next thing you know, they are having B3s
     

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  5. Cosmin2000

    Cosmin2000 Active Member

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    Wow...The magical V-FET trio, B-1, B-2 and B-3. Lucky man! Seems like they put more metal in the B-3, the last of them... Sound-wise, only you can express an opinion. Comments regarding the sound of the three?
     
  6. rottalpha

    rottalpha Yamaholic Subscriber

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    More metal?? not sure what you mean..both B2 and B1 are substantially larger and heavier than a B3...as a matter of fact, the B-1 is more than twice as heavy, or heavier than two B3s, however you want to put it.

    Can't comment about the sound yet, but I will eventually do a side comparison at some point. All I can say for now is that if they sound as good or close to the rest of the family, they are keepers.
     
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  7. vintagejapan

    vintagejapan AK Member Subscriber

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    As Pete mentioned sides screws off and the top cover pops out.

    At the moment running the B-3 with a Luxman CL-36 modified tube pre. Speakers sometimes Pioneer S-955III and other times Yamaha NS-2000. Both speakers are a great match for the B-3. I still have 3 weeks to go before some time off. Will try to finish this project then and post all the pics as I go.
     
  8. Oilmaster

    Oilmaster Drillers go deeper Subscriber

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    1B1 + 1B2 = 2B(1+2) = 2B3

    It's only a logical development :cool:
     
  9. rottalpha

    rottalpha Yamaholic Subscriber

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    :rflmao:
     
  10. rottalpha

    rottalpha Yamaholic Subscriber

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    This one is classic. Don't mind if I'll "borrow it"

    :rflmao:
     
  11. zaibatsu

    zaibatsu Well-Known Member

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    Last edited: May 10, 2018

     

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  12. rottalpha

    rottalpha Yamaholic Subscriber

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  13. rottalpha

    rottalpha Yamaholic Subscriber

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  14. Oilmaster

    Oilmaster Drillers go deeper Subscriber

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  15. rottalpha

    rottalpha Yamaholic Subscriber

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    true that!

    one observation about the suggestion I made is that it still needs to be physically verrified as in: pull out an original, take physical measurements of it, then compare against the datasheet of the Omron....or the Panasonics in the first link.

    I allways had good experience with Omron for the same reasons you named. ...If fits like a glove with the same footprint an similar exterior dimensions as the older Japanese relay is replacing.
     
    Last edited: May 11, 2018
  16. zaibatsu

    zaibatsu Well-Known Member

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    @rottalpha
    Thankyou, yes I have one pulled out on my desk here.
    I can take some measurements if needed.

    The original part is a Matsushita (i.e. Panasonic) HC4 which is why I asked about those.
    HC4a-P-DC24V is the original PN.
     

     

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  17. rottalpha

    rottalpha Yamaholic Subscriber

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    yes, a panasonic or anything Matsushita replacement is allways good if available.

    I think the comments above were about the other brand from rs-online

    Please let me know if the actual measurements of your pull match the data sheet from any of the Pannies you linked, or the Omron I suggested
     
  18. rottalpha

    rottalpha Yamaholic Subscriber

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  19. zaibatsu

    zaibatsu Well-Known Member

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    Just measured mine:

    27.8 x 21.5 x 33.5mm (LxWxH)

    Terminal outermost width: 13.5mm (measured from center to center of outermost pins)
    Terminal outermost length: 17mm
    Terminal lengthways gap spacing: 4mm (between "front" two rows of 4 pins), 6.5mm (between "middle" two rows of 4), 6.5mm (between row of 4 and 2).

    Hopefully that makes sense.

    Closest match (esp. for height) looks to be the Panasonic relay. Omron probably fits but spec says it's a bit taller.
    Pretty sure the one you linked is correct, HP means solder pins = matches stock.
    Same relay at mouser PN: 769-HC4-HP-DC24V.
     
  20. vintagejapan

    vintagejapan AK Member Subscriber

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    So back here. On the power supply board. Replaced all the electro's. Also replaced the 4mylar 0.01 caps. The should be of the same size with the originals or smaller. When board is installed there is really no room for taller replacements.
    IMG_7201.JPG IMG_4772.JPG
     

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