Another 2204 Build

Discussion in 'Building the Classics' started by Matt_Krush, Oct 26, 2019.

  1. neikeel

    neikeel Well-Known Member

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    I see you used 0.047uF couplers early in the preamp. Did you use those in the PI too. Think of a smaller capacitor as a smaller diameter hose, so the smallest caps in the signal change are limiters to your signal bandwidth...............
     
  2. Matt_Krush

    Matt_Krush Well-Known Member

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    ^^^ Yep, that's next...I just had the 2 in my stash and didn't want to parallel another set of .022uf
     
  3. South Park

    South Park Well-Known Member

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    The smaller the coupler cap the more signal gets thru. A little more gain.
     
  4. neikeel

    neikeel Well-Known Member

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    Oh, rully? Do explain:agreed:
     
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  5. Exojam

    Exojam Well-Known Member

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    So this is what you are getting for your tone stack?

    tone stack.png
     
  6. Exojam

    Exojam Well-Known Member

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    Having never modded a tone stack, what would you not something more like this one? Mine on top and yours on the bottom.

    Or am I thinking to much like wanting the output of a subwoofer; being a more flat response?

    tone stack A.png
     
  7. South Park

    South Park Well-Known Member

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    The graph is the frequency that gets thru the circuit . It is a old gain mod the smaller you go on coupler caps the easer the signal gets thru the cap. Less resistance
     
  8. Exojam

    Exojam Well-Known Member

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    I understand what it is and what it does, I have a feeling you did not understand what I was asking Matt.
     
  9. Matt_Krush

    Matt_Krush Well-Known Member

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    @Exojam.
    Yes the 1st graph above is what I went for. I used that calculator.
    I was intentionally trying to bring the mids down and get a wider range of control...and shift the control frequency for mids.
     
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  10. Exojam

    Exojam Well-Known Member

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    Thank you very much for explaining why you went in that direction for your tone.
     
  11. South Park

    South Park Well-Known Member

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    The tone shaping is done a little bit along the whole preamp circuit. Not just in the tone stack. The pick up produces a lot of mids to start with.the stock Marshall tone stack takes that into account. It can alter the gain to
     
  12. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Sag happens because the voltage of the power supply filter cap is loaded (for a period of time) and then the voltage starts to drop because it has used up the available current.
    The voltage drops down, that's when sag happens.
    As the guitar note decays, the available voltage charges the filter cap back up again.
    A larger choke does not increase the available current.

    The available current remains about the same, but the resistance of the choke will only drop more voltage, not increase available voltage (it's not a magic thing that makes more voltage)
     
    Last edited: Nov 20, 2019
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  13. junk notes

    junk notes Active Member

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    Chokes more or less affect feel. Has some play on tone.
     
  14. Matt_Krush

    Matt_Krush Well-Known Member

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    Almost complete.
    Just need to add the shielding for the head shell...
    A couple more 'check-overs'
    some tube rolling...
    make the rear screen...

    And it'll be ready for full use.

    MDG 501 Resized.jpg

    even though its no longer a Marshall, I kept some of the Marshall styling so it still well on a Marshall Cab..
    Head came out pretty good...I need a pneumatic stapler for the piping (it isn't Marshall tight in the corners...but what the hell, looks good from a distance)
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    (south park said)
    "The smaller the coupler cap the more signal gets thru. A little more gain."

    Smaller in size, or smaller in uF?
    And if I use a little tiny itty bitty micro mini cap I will get mega monster gain?
     
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  16. proxy

    proxy Active Member

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    Sounds great Matt
     
  17. Exojam

    Exojam Well-Known Member

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    Matt,

    Would you be so kind as to tell me what chassis and front/rear panels you are using?

    Thanks, James
     
  18. Matt_Krush

    Matt_Krush Well-Known Member

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  19. Exojam

    Exojam Well-Known Member

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    Thank you very much!
     

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