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Simms Watts Solid State PA100

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  • Simms Watts Solid State PA100

    Hi I am trying to repair an old Simms Watts amplifier it is a solid state PA100 and was hoping someone may be able to help with the shematic or tell me where I could obtain one.
    I have searched but can only find the tube amps

    Many thanks

  • #2
    Simms Watts Solid State only

    https://music-electronics-forum.com/showthread.php?t=43642&p=478217&viewfull=1#post478217

    https://music-electronics-forum.com/attachment.php?attachmentid=46773
    It's All Over Now

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    • #3
      Thank you for the prompt reply but sadly the schematics you suggest are nothing like this model which is PA100 Solid State it has 2 x 2N4348 power transistors externally on the back it has four inputs on the front plus echo in and out.
      The label on the rear shows Simms Watts EMI .

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      • #4
        Can you post photos of the circuit board, both sides?

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        • #5
          I have been trying to post pictures but without success not sure if it's me but it doesn't seem obvious how to do it

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          • #6
            Originally posted by bobr View Post
            Hi I am trying to repair an old Simms Watts amplifier it is a solid state PA100 and was hoping someone may be able to help with the shematic or tell me where I could obtain one.
            I have searched but can only find the tube amps

            Many thanks
            Try this for the power amp. It's possible the transistors in yours have been substituted as the 2N4348 and 2N6262 are similar.

            Click image for larger version

Name:	PWR101-1 Vocal Blender, AP100, PA100(-R), Disco MK3A.jpg
Views:	1
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            Experience is something you get, just after you really needed it.

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            • #7
              Originally posted by bobr View Post
              I have been trying to post pictures but without success not sure if it's me but it doesn't seem obvious how to do it
              I think it may be you're hitting new poster restrictions. Try putting on a hosting site such as OneDrive, Google Drive or dropbox and then sharing the link.
              Experience is something you get, just after you really needed it.

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              • #8
                https://drive.google.com/drive/folde...7V?usp=sharing
                Attached Files

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                • #9
                  Thank you so much nickb
                  I will have a look at the amp tonight

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                  • #10
                    The schematic posted by nickb looks like the right one. I made a basic layout showing the locations of the transistors.

                    https://music-electronics-forum.com/...1&d=1590686138
                    Attached Files

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