I did the 500k OCD Mod.

Discussion in 'Effects, Pedals, Strings & Things' started by nothereanymore, Dec 10, 2005.


  1. nothereanymore

    nothereanymore Member

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    It fixed what i did not like about the pedal. It is exactly what i hoped the pedal would be when i bought it. If you like the hi fi thing the stock one has then leave it alone if you don't try it. I will warn you it is a bitch to do because of the gooping. The circuit board is gooped after the pedal is put together so you have to cut the goop from the side of the encloser. But worth the hour i spent doing it.
     
  2. Deaj

    Deaj Silver Supporting Member

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    I ordered a bunch of parts from Mouser this morning including the pot for this mod. I'm interested in hearing the difference and willing to put in the effort. Thanks for the report! :)
     
  3. Ed Reed

    Ed Reed Senior Member

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    what value is the stock pot?
     
  4. Gary Brennan

    Gary Brennan Old cavorting member Gold Supporting Member

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    Larry or anyone else,

    Please someone post some comparison clips of the OCD mods. Thanks,

    gb
     
  5. WailinGuy

    WailinGuy Member

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    Please post the Mouser part number for the particular 500K audio pot. Thanks!

    I'm also interested in finding out what the stock pot value is.
     
  6. phoenix 7

    phoenix 7 Silver Supporting Member

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    Larry,

    Can you describe specifically how the mod affects the sound? I understand it provides more mids and smooths out the top end. Does the pedal sound fatter now for single note lines?
     
  7. nothereanymore

    nothereanymore Member

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    When i got the OCD i loved the amount of gain it had, i liked the way it felt under the fingers. I was hoping it was going to be a nice full body gain pedal, but it had what i would describe as a Aural exciter thing to it i could never get out. So yes it would be better for single coils the tone control is way more effective now noon is not to bright or dark, so you have something to work with.
     
  8. Ed Reed

    Ed Reed Senior Member

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    So you replaced the tone pot?
     
  9. Ed Reed

    Ed Reed Senior Member

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  10. Ed Reed

    Ed Reed Senior Member

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    Could the same thing be acomplished by adding a resistor across the pot some way?
     
  11. dosmun

    dosmun Member

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    If the stock pot is larger than 500K
     
  12. Straleno

    Straleno Member

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    Yes, please, someone figure out if the same thing can be accomplished by adding a resistor across the pot, rather than wrenching it out!
     
  13. Ed Reed

    Ed Reed Senior Member

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    Just for fun I held some different value resistors across the lugs of the pot and it did change the tone simular to the description on Fulltone's sight BUT not having a correctly modded pedal to compare it to, I don't know how close it comes. I did not commit to solider.
     
  14. D.G.

    D.G. Member

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    Try this page http://www.projectguitar.com/tut/potm.htm
     
  15. Ed Reed

    Ed Reed Senior Member

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    When I put the resistor across the two outside lugs it didn't sound right, I got a better result on the middle and the outside lugs. Like I said though, I really don't know what I doing.
     
  16. NuSkoolTone

    NuSkoolTone Member

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    Good Site. So assuming the stock pot is 250k, How about a push-pull pot that engages resistors to change the volume pot value? That way you have both! Might be handy going form a les paul to a strat for instance...
     
  17. suhr_rodney

    suhr_rodney Supporting Member

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    Has anyone pulled the original volume pot from the circuit to measure the DC resistance? It's meaningless, but in the circuit the pot in mine measures around 88k ohms. Just trying to avoid tearing apart the pedal if I don't have to.

    Also, I'd love to know sources and part numbers for the 500k ohm pot. Too bad Fulltone does not provide more info on this topic.
     
  18. dosmun

    dosmun Member

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    If the stock pot value is smaller than 500k you won't be able to add a resistor. To get to 500K you would have to add a resistor in series with the pot and that would eliminate some of the sweep of the pot.
     
  19. RMcFarland

    RMcFarland Supporting Member

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    I would be afraid of losing the beautiful upper register harmonic overtone I am getting....If it is indeed "smoothing out the top end" it is probably cutting treble. Why not just roll back the tone knob?

    Off-topic, this may be the best suited overdrive for a telecaster....it retains all of the bite and bass for some healthy distorted twang and the treble stays intact with great harmonics when doing steel bends.......INCREDIBLE PEDAL........
     
  20. suhr_rodney

    suhr_rodney Supporting Member

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    The stock part is 100k. Can someone please post the part number and/or a source for the 500k part?
     

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