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Boss SD-1 mod for bass

Discussion in 'Effects [BG]' started by screaminglucy, Oct 10, 2009.


  1. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    I just finished modding my Boss SD-1 to fulltone bass drive specs. I compared it to the real thing and i cannot tell them apart. Here are the components i changed in the SD-1 in case anyone else is interested in this...

    R2 = 620k
    C2 = 1uf
    C3 = 0.068uf
    D6 = jumper (short)
    D5 = 1n4005
    D4 = 1n914
    R7 = 1k
    put 47pf across clipping diodes
    C4 = 0.22uf
    C5 = 0.22uf
    R8 = 220
    remove C6
    R9 = 1k
    C8 = 0.1uf
    R16 = 100
    C10 = 10uf

    Flat mids switch adds 47k in series with 0.01uF between pin 1 of the opamp and pin 1 of the overdrive pot (the lug connected to R5)
    I also swapped the opamp for NJM4558D
     
  2. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    gregmon79 likes this.
  3. bass-shy

    bass-shy

    Jan 11, 2005
    Florida
    Cool! Thanks for sharing. I have an SD-1 lying around. I just might have to give this a shot.
     
  4. is this fulltone with booster on? or off?


    is R6 just 100 ohms?
     
  5. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    boost on....gain up to 9 o clock is like boost off. i didnt do the comp cut switch.

    r16 is 100ohm
     
  6. conundrum

    conundrum

    May 10, 2008
    Canada
    What's a good place to buy these parts, a radio shack type store, or Digikey?
     
  7. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    smallbearelectronics is the easiest to find the right parts. otherwise radioshack, digikey, or mouser.
     
  8. I gotta ask what a jumper is. I just started building my own stuff and have seen that word a few times.
     
  9. dune2k

    dune2k

    Sep 26, 2009
    Germany
    Basically a piece of wire that makes a connection between two points.
     
  10. Thats what I thought, but it seemed TOO obvious. Thanks.
     
  11. conundrum

    conundrum

    May 10, 2008
    Canada
    edit: Maybe a Monte Allum mod would be less complicated for me to start off with.
     
  12. T.A.P Bass

    T.A.P Bass

    Jan 7, 2010
    Bump

    Waiting for the clips.
     
  13. I just did the Monte Allums SD-1 mod, but I had guitar in mind. I'll have to try it on bass. Unfortunately, I never use fuzzy bass in real life, so I'll be a poor judge if it's any good or not.
     
  14. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    I'm now using a red llama for my overdrive. I find it retains more low end. It does sound more towards a fuzz sound though.
     
  15. markxander

    markxander

    Jan 15, 2012
    Toronto, ON
    Still have that modded SD-1 hanging around? :D Shoot me a PM if you feel like selling it ha
     
  16. lavaxtris

    lavaxtris

    Feb 3, 2009
    Stow
    bump

    wheres the sound clips?
     
  17. gregmon79

    gregmon79 I did it for the muff... Supporting Member

    Dec 20, 2012
    Chicago IL
    If you were to compare your mod to onee of the monteallum mods, which would it be??
     
  18. screaminglucy

    screaminglucy

    Jul 20, 2009
    TX, USA
    what's a monteallum mod? got a link?
     
  19. gregmon79

    gregmon79 I did it for the muff... Supporting Member

    Dec 20, 2012
    Chicago IL
    I'd really to know if your mod is anything like the stacked mod that monte Allum does. That's the one I got.
     

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