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VOX AC30 C2 solid state rectifier PT + schematics needed

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  • #1

    VOX AC30 C2 solid state rectifier PT + schematics needed

    My customer brought a fairly new C2 custom with SS rectifier. The PT is gone and need replacement. I ordered a PT from Hammond, but was sent the wrong one as it had pins for a rectifier tube heater.

    I could not locate the schematics for this amp online. Does anyone have it by any chance?

    Would anyone know where to order a PT replacement for this amp?

    Thanks very much for the help.
    "Tubes are less likely than semiconductor devices to be destroyed by the electromagnetic pulse produced by nuclear explosions and geomagnetic storms produced by giant solar flares."
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  • #2
    COntact Vox and ask them for the schematic. I have it but the file is 11MB.

    If a transformer works otherwise, you don't need to connect the 5v winding if you don;t want it. There is no tube rectifier in this model.

    The thing is only a couple years old, I'd bet Vox has the transformers. The part number for the 120v power transformer is: 530000002051 COntact a Vox dealer or parts seller.
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      Thank you Enzo. I had contacted Korg already and am waiting for their reply.

      The problem with this replacement PT I received is not the 5V tube rectifier windings, but the missing windings with orange wires the broken original has. The original has on secondaries 2 yellows for heater, 2 reds for B+ and then 2 orange wires (all going to PCB) that I'm not sure what they do. Maybe separate B+ for preamp tubes, but I need those to make the amp run again.
      Without schematics it takes too much time to figure things out. I just need to exchange the PT for the correct one.
      Last edited by kka; 11-30-2012, 05:32 AM.
      "Tubes are less likely than semiconductor devices to be destroyed by the electromagnetic pulse produced by nuclear explosions and geomagnetic storms produced by giant solar flares."

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      • #4
        Just me thinking out loud. Hammond probably sent you a transformer suited to an AC30 - the old original AC30. It is not going to have the more modern low voltage windings.

        The odd winding is for the low voltage rails, +/-27vDC.

        And there are both AC30C2 and AC30CC2, which are different amps.

        KorgUSA is the US distributor for Vox. Korg, in Japan owns Vox. Vox is in the UK. These all are related, but are separate entities. KorgUSA may help you, but if they don;t or can't, contact Vox directly. I haven't looked, but the Vox web site might even have some schematics.

        The schematic should show you what all the windings do.
        Education is what you're left with after you have forgotten what you have learned.

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        • #5
          No they sent me their model# 290MX which is for the "AC30 reissue". Since they are different reissue versions they don't have the one I need which I know only now.

          Thanks for the windings info, makes sense. This amp is a AC30C2 as stated on the PCB. I think there is a C2 with tube rectifier and (like mine here) with SS rect. Confusing.

          BTW this amp was purchased just 3 months ago. The customer prefers paying for the repair himself rather than sending it to GC's out of state warranty repair address where they quoted a 3 months turn around time. The shipping alone would set him back as much as the transformer costs, then 3 months wait.... I don't get it. Doesn't sound like a biz model for success to me.

          I will contact VOX directly. I wasn't even aware anymore that there is such a thing. I thought Korg took over completely. Good to know. Thank you again.
          "Tubes are less likely than semiconductor devices to be destroyed by the electromagnetic pulse produced by nuclear explosions and geomagnetic storms produced by giant solar flares."

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          • #6
            Korg may own them, but that doesn't mean they disappeared.

            If someone buys a new Vox product, it has a warranty from Vox. GC may add their own warranty, but regardless of that, the factory warranty holds force. Your guy can take his amp to ANY authorized Vox repair center. In Michigan I am one for example. You do not have to use GC's particular repair station.

            Here, select California for yours.
            VOX USA Service Centers
            Education is what you're left with after you have forgotten what you have learned.

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            • #7
              I'd contact Mercury Magnetics. They're pricey but they seem to know as much as anyone about the subject of iron. I'd be ready with some dimensions.

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