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  • Need help with a technical question, please

    Hi, I'm just trying to clear something up here. I bought this amp second hand. I wish to confirm the design mains fuse size. From the pic you can see 3/1.5 is indicated. At this point I'm going right ahead and assuming 3A for 110V, and 1.5 for 220V, due to the values in my Marshall being about the same. I guess what's throwing me is 110/220 does not correlate with 50/60 hz...i.e they're written back to front.

    Unfortunately the existing fuses are some Russian jobs with no discernible markings.

    Thanks

  • #2
    I think you forgot the picture. A schematic or amp model/manufacturer would help also.
    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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    • #3
      Oh sh!t I have a habit of doing that sorry. I'll get it sorted
      Attached Files

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      • #4
        I agree with your assumption that it's 3A for 110V, and 1.5 for 220V. A schematic might tell us for sure.
        "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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        • #5
          You have the fuse values figured out. The 50/60Hz thing doesn't matter. Neither one has a bearing on the fuse size.
          Education is what you're left with after you have forgotten what you have learned.

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          • #6
            Ok great thanks matey!

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            • #7
              What is implied is that the unit can be internally wired for 110 or 220Vac.

              50 OR 60 Hz.

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              • #8
                And the 50/60hz is not a switchable option. It is a design feature and common specification indicating the transformer will work at either frequency, regardless of voltage. I think because the designation was already in common usage, they wrote it exactly as it is commonly used.
                Originally posted by Enzo
                I have a sign in my shop that says, "Never think up reasons not to check something."


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                • #9
                  What Amp is it? It looks like a Sovtek Mig50, which normally has a Mains switch for 110/220 VAC on top of the chassis. It's a good idea to check the correct mains voltage.

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