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ampeg svt-4 Pro Transformer wiring

Discussion in 'Amps and Cabs [BG]' started by brogandutcher, Feb 15, 2016.

  1. brogandutcher

    brogandutcher Commercial User

    Apr 26, 2011
    Nashville TN
    I recently changed the transformer in my Ampeg svt4 Pro and I need to now what wires go where on the board interface. Im sketched out proceeding with little information because one wrong terminal could blow the amp obviously. does anyone have any information on where every plug goes onto the board?? Thanks!

    Attached Files:

  2. B-string

    B-string Supporting Member

    The 4 schematics used to be up on Ampeg/LOUD's site Ampeg : Support. You could request it if it is not. I'll have to check through my cache later.
  3. B-string

    B-string Supporting Member

    I found this posted on another forum, not sure how much it will help you.

    Attached Files:

  4. brogandutcher

    brogandutcher Commercial User

    Apr 26, 2011
    Nashville TN
    thanks for the schematic. '

    the problems is where do the the blue, blue and white, purple, brown and grey wires go?

    Attached Files:

  5. B-string

    B-string Supporting Member

    Sorry I have not been inside one since 2001/2002 so I can't help there. From the schematics is sounds as if you have an export power transformer?
  6. BassmanPaul

    BassmanPaul Inactive

    Methinks you should have taken a few photo’s BEFORE you took the old transformer out! A tip for the future is to cut the wires off the old transformer and leave them soldered in place. after installing the new transformer you can terminate each wire in place of the cut wires one at a time.
  7. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    The schematic that Jon posted (that he found on the internet) shows the wire connections for 120V, 240V, 230V, and 100V. You can see the color coding. Wires that aren't used, such as the blue-white, can be isolated and secured. Here is an additional schematic that has labels for the power connections. This is printed on the board.

    Even if this makes it clearer, it would be a good idea to speak to hodgy at Loud customer service to confirm the connections.

    Attached Files:

  8. Troubleshooters


    Mar 20, 2016
    Hello brogandutcher. If you still need to know how to connect your power transformer, this answer is for you. Black =J19; Brown = J20; White = J14; Violet/Purple = J22; Blue = J24; Blue and White = J16; Gray = J25. This connection will allow your amplifier to work on 120 VAC mains voltage. Best regards from Troubleshooters.
    svtb15 likes this.
  9. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

    Feb 24, 2021

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