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How do you make a Simple load Tester

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  • How do you make a Simple load Tester

    I saw on Utube a guy had a inputjack with a big gold colored resistor so he could test Fender amps..Every time I try to check my plates the sound of the speaker makes me jump in the air.Can someone draw a picture so DAB can make one

  • #2
    https://www.google.com/search?q=audi...w=1280&bih=578

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    • #3
      The basic idea is very simple. Replace your speaker with a big power resistor (mounted on a large heatsink) of the same nominal impedance as the speaker. Just search for 8 ( or or 16) ohm 100w resistor.
      Experience is something you get, just after you really needed it.

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      • #4
        The Weber Tru Load will work for most tube amps (200 watts) and has test points for volt meter and an oscilloscope BNC output. If you need to load a more powerful solid state amp then you'll need to build one.

        https://www.tedweber.com/tru-load

        I use the True Load for all my tube amp work.

        Click image for larger version

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        • #5
          Bob was it Dlab? This guy >>>
          https://youtu.be/8jFKa8AJkFo
          The drawing for it is in the video too.
          When the going gets weird... The weird turn pro!

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          • #6
            Originally posted by DrGonz78 View Post
            Bob was it Dlab? This guy >>>
            https://youtu.be/8jFKa8AJkFo
            The drawing for it is in the video too.
            Neat but no heatsink means those 25W resistors can only handle about 9 watts.

            To get the full 25 watts you need a 3.2C/W heatsink or just use for a minute or so and then leave to cool for a bit.
            Last edited by nickb; 02-17-2019, 10:21 PM.
            Experience is something you get, just after you really needed it.

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            • #7
              Thanks He must of got bugged alot and made this New video more detailed I just want to check my old Bandmaster out once in a while..And that pop made me jump in the air

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              • #8
                It there a polarity to these resistors,does it matter which way you solder them on to the jack..

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                • #9
                  Originally posted by dumbassbob View Post
                  It there a polarity to these resistors,does it matter which way you solder them on to the jack..
                  Resistors have no polarity
                  Logic is an organized way of going wrong with confidence

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