GK MB112: Blue Light, No sound?

Discussion in 'Amps and Cabs [BG]' started by Cuauhtemoc, Apr 18, 2017.


  1. Cuauhtemoc

    Cuauhtemoc

    Dec 28, 2012
    Hi everyone,
    In late January I purchased a GK MB112 II online from the Guitar Center used gear page. I've been going direct for all my gigs recently so I didn't try it out until today.

    The amp turns on and the light goes from red to blue. When I try to play through it, nothing comes out. After about five minutes of messing with the settings, some super distorted notes suddenly came through. I turned it off and plugged it in to another outlet and couldn't get any sound to come out again.

    Any suggestions for what I might be able to do? I'm thinking that I won't be able to get any help from Guitar Center because because it's been about 80 days since I ordered it. I wish I had tested it out earlier though, because it seems that it must've came to me broken.
     
  2. Josh Kneisel

    Josh Kneisel

    Jun 17, 2016
    Arizona
    Bad pots? bad input or output jack? could be a number of things...Take it to a repair shop probably just needs a little tlc.
     
    Pumpkin likes this.
  3. blubass

    blubass

    Aug 3, 2007
    Modesto Ca
    Current: Blackstar, DR strings, Nady. Previous endorsements with: GK, Rotosound, Ernie Ball, Cleartone, EMG, Dean, Dava Picks, Rebel Straps, Dickies
    Yeah, neither GC or GK would be obligated to help you in any way. If you have any electrical knowledge you can open it up and see if anything looks unusual. Barring any knowledge, you're best to get it to a good tech to have a look. I stress good because more and more often there's posts on TB of techs that couldn't fix problems. Call GK and request an authorized service center close to you.
     
    agedhorse likes this.
  4. Pumpkin

    Pumpkin

    May 19, 2016
    Washington, DC
    Allegedly, if there's a major power issue/ internal amp issue, the blue light should stay red and not turn blue. That's promising. I would not try to open or fix it yourself, you have a much great chance of making it worse than you do of fixing it.
     
    agedhorse likes this.
  5. Cuauhtemoc

    Cuauhtemoc

    Dec 28, 2012
    Thanks for the advice, guys! I have some electronics experience but never worked on amps before. I'm gonna take in to Music & Arts tomorrow; they have a tech that they work with. The nearest certified service center is over an hour away. I've been reading previous threads on similar issues and maybe I should just open it up to make sure it's not stuffed with candy:laugh:
     
    Last edited: Apr 18, 2017
  6. blubass

    blubass

    Aug 3, 2007
    Modesto Ca
    Current: Blackstar, DR strings, Nady. Previous endorsements with: GK, Rotosound, Ernie Ball, Cleartone, EMG, Dean, Dava Picks, Rebel Straps, Dickies
    I wish I cracked open one of my amps and it was stuffed with Smarties and Cadbury Crème Eggs. I'd even settle for their Halloween offshoot, Scream Eggs. drool The amp would smell good when it got warm too!
     
  7. Cuauhtemoc

    Cuauhtemoc

    Dec 28, 2012
    UPDATE: Finally got a call back with an estimate.. turns out that the speaker is blown. Would cost $255 for the repair. That's what I paid for the amp to begin with. Since I'm handy enough with a soldering iron I think I'm just gonna replace it myself to save both time and money. Thinking of using an Eminence Beta 12a. Any thoughts, tips, or advice is appreciated!
     
  8. mmbongo

    mmbongo I have too many basses. Supporting Member

    1) I believe you need a 4 ohm speaker.

    2) You can get the proper speaker from GK for around $100
    MB112, 112MBP - Paragon12" 300W, 4 Ohm, Ceramic Bass Driver - gallien-krueger.com
     
  9. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    May 16, 2022

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