GT"The Brick"; how to change primary voltage switc

Discussion in 'Preamps / Channel Strips' started by Resurrected, Jan 15, 2006.

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  1. Resurrected

    Resurrected Guest

    Hi there,

    just ordered "The brick" from the US. Now I need to change the internal voltage switching from 110V to 230V as I live in Germany. I just had a look inside the unit but I cannot find any switch for my purpose.

    Any help ?


  2. Kev

    Kev Well-Known Member

    Nov 13, 2001
    IF the power transformer has dual primaries then it may be possible to re-configure the input

    sorry I just can't see enough detail to be sure
    you need a tech to look inside for your

    please be careful of the 220 / 230 mains power

    There was a thread here with better inside pictures but I can't find it right now
  3. Grooveteer

    Grooveteer Guest

    Here's the thread Kev is referring to: (I think)

    (Dead Link Removed)

    Hope this helps.
  4. Resurrected

    Resurrected Guest

    Voltage switch

    Thanks for your posts !!! As our bassplayer is a great tech engineer I'll ask him to do it. What I do not understand is why Groove Tubes claims that Pirmary Voltage is switchable inside; it's not that easy I think as there's no real switch at all...

    I'll tell you if I proceed...


  5. Grooveteer

    Grooveteer Guest

    Why don't you ask Groove Tubes? Last time I had a question Sam Austin was very helpful. You can reach him at proaudio AT groovetubes DOT com

    Good luck!
  6. Resurrected

    Resurrected Guest

    ...have asked Groove Tubes last week already

    I've asked GT last week but didn't receive any answer 'til yesterday. They've got the solution, here's their statement:

    "Find the two inside wires (RED, BLACK) off the power transformer
    follow them up to the power switch and cut them off at the power switch
    being carefull not to cut the other black and red wires.
    Now strip and twist them together.
    Also insulate.

    Done.... now you have just converted it from 120v to 230volts"

    Will check this out today & inform ya on the result...[/code]
  7. Kev

    Kev Well-Known Member

    Nov 13, 2001
    As I said
    dual primaries

    parallel for 110 volts
    series for 220 volts

    joining the (RED, BLACK) puts the primaries in series

    it's all good

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