B-1 Quickie

Discussion in 'Yamaha' started by rottalpha, Dec 11, 2017.

  1. vintagejapan

    vintagejapan AK Member Subscriber

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    :( I know. Been looking for over a year now :no:
    Really like this integrated.
     
  2. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Which IC are you looking for ?
     
  3. vintagejapan

    vintagejapan AK Member Subscriber

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    Hi Patrice,

    These are the IC's. I get a static noise intermittent from the preamp. If I disconnect the preamp can still hear it but very faint.
     

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  4. rottalpha

    rottalpha Yamaholic Subscriber

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    sounds like my TA-5650 preamp issue, except that on mine the noise is on at all times.
     
  5. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Hello Alex

    Did you get trouble on one channel or the both ?
    I saw that in your 8650 that there is 2 BX-269A . If you have trouble on one channel try to use the right IC on left channel to see ....If the trouble stay there
     
  6. Vint Age

    Vint Age B-1 With Yamaha

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    CM-5000 SOTA.jpg
    :)
     
  7. rottalpha

    rottalpha Yamaholic Subscriber

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    YAMAHA PLZ BRING THIS KIND OF INOVATION BACK!
    This is what I call a true engeneering company. Unfortunately, in the end the economics of a business will trump the engeneering of the products they sale.
     
  8. Vint Age

    Vint Age B-1 With Yamaha

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    Yes indeed and with that said we should feel very fortunate to have a few pieces of that fine engineering innovation to appreciate and enjoy. :thumbsup:
     
  9. 808_state

    808_state Active Member

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    331
    I've noticed on other threads that in some cased you guys have used the Tokin SIT/vfets as a replacement for the originals. Is this a viable option for the B-1, B-2 & B-3? Are the Tokins themselves hard to find?
     
  10. rottalpha

    rottalpha Yamaholic Subscriber

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    certain rank 2SK-180 Tokin V-fets can be used for B-1. No Tokin solution for B-2, B-3.
     
  11. cdfac

    cdfac AK Subscriber Subscriber

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    Just thought I would comment that a proper B-1 will run very hot. Class A hot (or hotter, depending on your particular reference). It will test the 5-second rule on your palm. Those are very beefy heatsinks for one transistor each. Don't worry.

    I miss mine all the time. If the money allowed, I would buy mine back.
     
  12. Vint Age

    Vint Age B-1 With Yamaha

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    Yes indeed! Here's mine sitting quiescent at 114.8° F. :yikes: :)

    Hot Stuff.jpg
     
    Last edited: Feb 9, 2018
  13. rottalpha

    rottalpha Yamaholic Subscriber

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    and that is precisely why no one should place them inside a cabinet of have something stacked on top of a B-1 while the power is turned on.
    This is also why 105 deg C rated caps are a must in thins thing. Is fine to use Audio grade caps on the driver boards and the filter board, since those are away from any major sources of heat, and those are usually rated at no more than 85deg C.

    I posted some B-1 trivia with heat readings at different points. where your thermometer is sitting is right above PSU buard number 2 and the three 2-Watt resistors, one of the hottest places in this amp.
    was gonna add....the three 2-watt resistors BBQing that cap right above, if it is not moved to the back side:D
     
    Last edited: Feb 9, 2018
  14. rottalpha

    rottalpha Yamaholic Subscriber

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    Vint Age, today you must be really glad the B-1 gets really hot :biggrin::biggrin::biggrin:
     
  15. Vint Age

    Vint Age B-1 With Yamaha

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    Yes indeed. It's cold up here in the great white north! :thumbsup:
     
  16. rottalpha

    rottalpha Yamaholic Subscriber

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    same in the midwest and I will be going there next week, leaving the nice 75deg weather. Glad I have the room heather waiting for me :D
     
  17. rottalpha

    rottalpha Yamaholic Subscriber

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    Hi VJ,
    I meant to bring this up to your attention:
    I have seen the insides of more B-2s than most people. Your B-2 PSU board pictured here is one of the nicest, free of heat burns B-2 PSU boards I have seen so far.
    If you want to keep it that way, you need to take it out and replace the red power resistors, or find a way to raise them above the board.
     
  18. vintagejapan

    vintagejapan AK Member Subscriber

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    Location:
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    Thank you for your advise. At the moment do not have a B-2 in my possession, that one went to a good friend, had to let go of half of my rig when moved, but in a future day will surely get my hands on another B-2 for myself. Next project is the Sony 8650.
     

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