2203 tone cap identification

Discussion in 'The Workbench' started by Dominic Lampron, Sep 24, 2020.

  1. Dominic Lampron

    Dominic Lampron Member

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    Can anyone help me identifying the bass and mid cap in the tone stack of my 2203 JMP? Is 1=bass and 2=mids? Am i right? Thanks!
     

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  2. South Park

    South Park Well-Known Member

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    I don’t think those are in the tone stack . 022uf coupler caps
     
  3. neikeel

    neikeel Well-Known Member

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    those are the 0.022uF 400v mustard caps that couple to the EQ pots. Tone stack cap is the ceramic disc just next to them. Typically 470pF or 500pF.
    The ceramic disc further across is the bright channel mixer bypass cap (really another treble peaker as in this circuit the non-bypassed resistor is grounded
     
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  4. william vogel

    william vogel Well-Known Member

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    To answer your question. 1 is bass and 2 is mid. Follow the Pink wire If it goes to the middle pot, 2 is mid and if the brown wire goes to the treble pot, 1 is bass.
     
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  5. Dominic Lampron

    Dominic Lampron Member

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    Ok! Thanks! But according to the Duncan TSC, those 2 mustards caps are acting in bass and mids and when changing values, the EQ response change... Also, for the bright cap, what will it do for the tone of the amp if i lower the value? Will it be like the treble cap? (i’ve swap the 470pf for a 220pf to change the treble EQ sweep, much less agressive!)?
     
  6. Dominic Lampron

    Dominic Lampron Member

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    thanks!!
     

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