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5f1 kit distortion and low volume after kit build

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  • #1

    5f1 kit distortion and low volume after kit build

    I have checked all the wiring switched out the tubes and cannot figure out what is wrong. When I turn the volume control up I hit a spot at about 75% of the way up where a get a sort of squealing sound then no output after that. below that point I have output but distorted and very low volume.

    Any suggestions would be greatly appreciated.

    Lee
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  • #2
    Sounds like you have a parasitic oscillation going on; when you hit that spot on the dial, it's swamping the signal. Which kit did you build, did it provide a layout, and did you follow it? Can you post a schematic and any docs that came with it?

    PS: keep only one thread open; first, it's bad forum manners to run three concurrent threads, and two, it keeps the flow of information & progress all in one spot. Thanks!

    Justin
    "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
    "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
    "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

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    • #3
      Originally posted by Justin Thomas View Post
      Sounds like you have a parasitic oscillation going on; when you hit that spot on the dial, it's swamping the signal. Which kit did you build, did it provide a layout, and did you follow it? Can you post a schematic and any docs that came with it?

      PS: keep only one thread open; first, it's bad forum manners to run three concurrent threads, and two, it keeps the flow of information & progress all in one spot. Thanks!

      Justin
      Thank you. Here is the layout.http://www.tedweber.com/media/kits/5f1_layout.jpg
      Sorry about the multiple threads I am new to this and had a hard time finding what I thought was the right place to pose my question. I will go back and delete the duplicate threads.

      Lee

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      • #4
        Originally posted by Justin Thomas View Post
        Sounds like you have a parasitic oscillation going on; when you hit that spot on the dial, it's swamping the signal. Which kit did you build, did it provide a layout, and did you follow it? Can you post a schematic and any docs that came with it?

        PS: keep only one thread open; first, it's bad forum manners to run three concurrent threads, and two, it keeps the flow of information & progress all in one spot. Thanks!


        Justin
        I also built a Hoffman kit with a weber W022772 power transformer and got no sound at all.http://el34world.com/Hoffman/files/Hoffman_5F1.pdf

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        • #5
          Try reversing the red and blue wires from the output transformer.
          Stick with fixing the Weber for now, once it's good you can start a new post about the Hoffman.
          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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          • #6
            Originally posted by g1 View Post
            Try reversing the red and blue wires from the output transformer.
            Stick with fixing the Weber for now, once it's good you can start a new post about the Hoffman.
            Thank you, that solved the sqelching problem at 75% volume. However, the problems of low volume, distortion and no output above 75% volume remain.

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