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Thread: Transformer Primary Wires ?

  1. #1
    Join Date: Jul 2008

    Location: Devon

    Posts: 88
    I'm Terry.

    Default Transformer Primary Wires ?

    Hi
    I'm doing an Ear phono stage build and am stuck.
    I've got Hammond 369AX Power Transformer but I'm confused as to which wires from the Primary windings I have to use. I'm pretty sure I use the two green wires from the secondary to the AC 6.3V/2A on the board and the other two red wires from the other secondary to the AC/230-380V on the board. (as in the picture below). The 369AX spec sheet says that units are designed to have both Primary windings engaged, so I don't know which wires I should use, I've attached a couple of pics so if you can guide me that would be great.
    Thanks
    Terry
    Attached Images Attached Images

  2. #2
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,846
    I'm openingabottleofwine.

    Default

    Unfortunately the third picture showing the primary windings is incomplete. But what is shown suggests you connect the brown and black wires together, and apply the incoming mains supply to the blue wire and to the corresponding wire for the other '120V' end.
    Barry

  3. #3
    Join Date: May 2012

    Location: Toulouse, France

    Posts: 6,562
    I'm Kevin.

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    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

  4. #4
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,846
    I'm openingabottleofwine.

    Default

    Thanks for the link Kevin.

    So to finish my reply: the two primary windings need to be connected in series by joining the brown and black wires together.

    The incoming mains supply is then connected to the blue wire and to the white wire.
    Barry

  5. #5
    Join Date: Jul 2008

    Location: Devon

    Posts: 88
    I'm Terry.

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    Thank you so much for this, really appreciated.

  6. #6
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,846
    I'm openingabottleofwine.

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    You're welcome Terry. Let us know how you get on.
    Barry

  7. #7
    Join Date: Jul 2008

    Location: Devon

    Posts: 88
    I'm Terry.

    Default

    Quote Originally Posted by Barry View Post
    Thanks for the link Kevin.

    So to finish my reply: the two primary windings need to be connected in series by joining the brown and black wires together.

    The incoming mains supply is then connected to the blue wire and to the white wire.
    Hi Barry

    I'm nearly there with this, just need to connect up the Transformer wires now.
    I have one more question if you don't mind, does the blue wire from the transformer go to the live and the white go to the neutral, or does it not matter which way they go ?

  8. #8
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,846
    I'm openingabottleofwine.

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    It doesn't matter which way round they are connected.
    Barry

  9. #9
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 6,867
    I'm Lawrence.

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    One of my amps has a reverse power polarity switch so it could be important.

  10. #10
    Join Date: May 2012

    Location: Toulouse, France

    Posts: 6,562
    I'm Kevin.

    Default

    It is AC, so why would it matter?
    Kevin

    Too busy enjoying the music....

    European loan coordinator for Graham Slee HiFi system components..

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