Triac for a McIntosh MA5100

Discussion in 'McIntosh Audio' started by manito, Apr 2, 2018.

  1. manito

    manito New Member

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    47
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    I am trying to restore a MA5100 and between the parts that my amplifier needs is a triac with part number 131-001 (according to the service manual) In another post where they restore a Mac 1900 with the same part number 131-001, the owner says that he bought 2 triacs from McIntosh and they sent him one with part number NTE 5623, does any of you know how it connects? some photo?

    http://audiokarma.org/forums/index.php?threads/triac-for-a-mcintosh-1900.262847/

    upload_2018-4-2_18-46-5.png

    upload_2018-4-2_18-42-36.png
     

     

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  2. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Hello

    The original component 131001 is GE SC41F obsolete since a long time . The component in picture sent by the factory is a substitute used in MA6100 .
    You can use it in your MA5100 respecting place of each pin
    see my pictures

    MA5100-043-821-protection-pcb.JPG


    MA5100-043-821-output-protection-pcb.JPG
     
    Last edited: Apr 3, 2018
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  3. manito

    manito New Member

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    Thank you very much for the information, I am making a list of parts that I need to buy online and when they arrive I will install it that way.
     
  4. manito

    manito New Member

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    I have been looking for a subtitle for the TRIAC NTE5623 (VDRM: 100V / Vgt: 2V / Igt: 50mA) and I have only found in mouser: 863-T2500DG (VDRM: 400V / Vgt: 2.5V / Igt: 60mA) and the 863 -T2800DG (VDRM: 400V / Vgt: 2V / Igt: 60mA), can someone help me to choose the right one?
     
    Last edited: Apr 13, 2018
  5. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Sorry , but why do you want to buy something else when you have already bought the part supplied by the factory and perfectly usable in your MA5100 ??
    Why looking for a 400V triac when the MA6100 original is perfectly working ??
     
  6. manito

    manito New Member

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    I found this amplifier in poor conditions and without some pieces so I have given myself the task of getting them little by little, in the photo that I upload to the forum it is missing one of the two triacs that come in that card you can also see that is none of the 4 fuses. I tried to collect some piece that would replace the NTE 5623 because in the mouser parts page I did not find that triac specifically, however I found it in a spare parts store in my city, that was something surprising! regularly nothing is found here. Once I have installed it I will upload the photo to ask for their opinions.
     

     

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  7. manito

    manito New Member

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    Finally I had the time to install the pair of triacs (among other things that need to install the amplifier), I upload the image of the arrangement that I made to match the legs of the triac, I also installed a couple of capacitors and the 4 fuses missing, please tell me if you see that something is wrong installed.

    upload_2018-5-1_20-10-30.png
     
  8. c_dk

    c_dk Addicted Member

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    You did not use non polorized axial capacitors.

    The heatsinks are not needed but will do no harm. You do know the amp will function without the tracs right? They are there to insure the supply fuses will blow to protect your speakers from possible DC.

    Have you connected both devices T2 leg to a common ground?
     
  9. manito

    manito New Member

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    Ok, I'll change them for non-polar, I looked in the service manual and did not say anything about that, maybe for that reason I did not find the polarity in the old capacitors that I removed.

    yep.

    Thank you very much for answering.

    upload_2018-5-1_21-31-22.png

    upload_2018-5-1_21-32-12.png
     
  10. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    :thumbsup: Look good

    just double check connections

    as previous said , heatsink not necessary at all
     
  11. manito

    manito New Member

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    final image with non-polar capacitors and triacs without heat sinks

    upload_2018-5-5_17-10-39.png
     

     

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  12. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Much better no ?
     
  13. manito

    manito New Member

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    You're right, it looks better, I just need to complete the rest of the replacement parts in order to know if everything is fine in this amplifier but I'll upload it in another post.
    Thank you very much for the help.
     
  14. clinic-audio

    clinic-audio all on YAMAHA untill 1990

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    Here are the right connections (difficult to see on pictures)

    MA5100-output-pcb.JPG
     
  15. manito

    manito New Member

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    Location:
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    Double check is better! Yes, I connected them that way, the triac on the left twisted legs 1 and 3 forward and leg 2 (slightly longer) backwards, the triac on the right twisted legs 1 and 3 backwards and leg 2 (slightly longer) forward.

    upload_2018-5-8_13-11-40.png
     

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