MXR Micro Amp

Discussion in 'Effects [BG]' started by BassOliverB, Dec 28, 2013.


  1. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    Hi guys,

    I bought a MXR Micro Amp as a boost pedal. (The reason I chose that specific pedal was that Flea also uses it) But it seems like it can't handle the input signal from my Modulus. No matter how much gain I add or remove it buzzes - but almost only when I use the E string.

    I thought it would be a great idea to use it since it works with Flea's bass.

    Any suggestions to how to fix the problem?

    The only reason for why I think it works with Flea is that Flea uses Wireless units, which might have a lower output compared to using cables.

    // Oliver
  2. Turtle71

    Turtle71

    Joined:
    Aug 11, 2009
    Location:
    Madison, WI
    I use the micro amp to boost the level of my stock P-bass up to the same level as my 1/4lb equipped P-bass, it does the job wonderfully with virtually no noise.

    I've also used it as a boost into my dirt pedals, I've used both passive & active basses, as well as 4 & 5 stringers, I've not experienced any of the noise you are having.

    It's possible you got a dud?

    I'll assume you've tried it with other basses to confirm there's not an issue with the Modulus? Excellent basses, so I doubt the problem lies there.

    I don't know much about the Modulus Flea bass, active preamp? possible dying battery? I've had bad/dying batteries give all sorts of weird noises & such.
  3. father of fires

    father of fires Supporting Member

    Joined:
    Nov 29, 2006
    Location:
    BALTIMORE CITY
    Well...why are you trying to boost?

    The Micoramp only has 7 volts or so of headroom and has potential to boost way beyond it's power limits.

    If you're bass is hot already then you don't have much room to boost before it hits the power limits and starts clipping.

    What are you boosting into? That could also be clipping if it can't handle the size of your now boosted signal.

    The Microamp is just your bass louder and really shines into overdrives or tube amps or for solo breaks.

    If you're just playing cleanly then it's better to use the input gain on your amp for more volume and kick on the microamp when you need juts a little bit more volume for a impact on a particular riff or such.

    It also has some nice buffering qualities so it is great to have in front of a long signal chain.
  4. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    Yes, I have also tried to use a Sterling by Music Man Ray 34. I got a tiny little less distorting effect with that...
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  6. Turtle71

    Turtle71

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    Excellent point.
  7. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    The reason for why I have the boosting pedal is when I want to turn up the volume for soloing fast, without having to stop, turn around and add a little bit of volume from the amp.

    The signal from the Micro amp goes directly into my GK amp. And there is no clipping on the amp.
  8. Modulator

    Modulator

    Joined:
    Dec 18, 2003
    Location:
    Traverse City, MI
    There's something wrong with your pedal. Get it looked at. I use a Micro Amp on a regular basis with a variety of basses (including a Modulus 6) and have never heard any hint of distortion or noise.
  9. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    Hmm, the pedal is not old, I bought it in July or August. So too bad if the pedal is already broken.
  10. Turtle71

    Turtle71

    Joined:
    Aug 11, 2009
    Location:
    Madison, WI
    Well, if that's all that's in your signal chain, and we'll assume the battery in the bass (if equipped) is up to snuff, then really all it can be is the pedal.

    Drop into your local music store and try another one out, assuming you've got a store near by that actually has one in stock :meh:
  11. Turtle71

    Turtle71

    Joined:
    Aug 11, 2009
    Location:
    Madison, WI
    If purchased new, it's should be well within it's warranty period, my personal experience with Dunlop/MXR has been excellent when it came to warranty issues or other customer service inquiries.
  12. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark

    Good idea.
  13. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    But we all agree that the Micro amp requires 9v and 100mA, right?
  14. Turtle71

    Turtle71

    Joined:
    Aug 11, 2009
    Location:
    Madison, WI
    Ya' Know, I've never really given it any thought, I just power mine with my Voodoo Lab PP2+ and go.

    It is indeed a 9V pedal that much I do know, but what it's amperage draw is...no idea. :(
  15. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

    Joined:
    Mar 16, 2002
    Location:
    Reims, Champagne, France
    Many GK amps have a footswitch for the boost knob. Which model do you own ?
  16. BassOliverB

    BassOliverB

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    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    It's the 1001rb-II
  17. father of fires

    father of fires Supporting Member

    Joined:
    Nov 29, 2006
    Location:
    BALTIMORE CITY
    My vote is still on clipping. Does it buzz the whole turn of the knob?

    Is the buzz responsive to your playing?

    Or is it like a hum sound in the background?
  18. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
    Location:
    Copenhagen, Denmark
    The buzz/distorting effect is there when I play hard on my E String. But it isn't there when I roll of the volume on my bass. The buzz is there probably only because of the input is too hot. But I still don't understand why Flea can use it without buzzing/distorting effect...
  19. BassOliverB

    BassOliverB

    Joined:
    Mar 31, 2013
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    BTW my playing style is just like Flea's.
  20. Turtle71

    Turtle71

    Joined:
    Aug 11, 2009
    Location:
    Madison, WI
    Well, we have to go on the grand assumption that Flea's version of the Micro Amp is stock, and not somehow modded to taste.

    That being said, it does sound like your driving the input too hot, but like I said I've driven mine with a really hot input as well (Tobias Growler 18V preamp...plenty of juice), and I don't clip my pedal at all...even at FULL volume on the bass.

    Try another one, see if it's the same result.
  21. willbassyeah

    willbassyeah

    Joined:
    Oct 9, 2011
    Location:
    Singapore
    if its only the E string, it might be your pickup height?

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