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Thread: Transformer Primary Wires ?

  1. #1
    Join Date: Jul 2008

    Location: Devon

    Posts: 81
    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: 30,480
    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: 6,295
    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: 30,480
    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: 81
    I'm Terry.

    Default

    Thank you so much for this, really appreciated.

  6. #6
    Join Date: Jan 2009

    Location: Essex

    Posts: 30,480
    I'm openingabottleofwine.

    Default

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

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