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Gallien-Krueger MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head
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      Gallien-Krueger MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head (581055)
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Gives you an all-tube preamp, 4-band EQ, and 500W of power.

The 500W Gallien-Krueger MB Fusion tube preamp incorporates the same all-tube preamp of the GK Fusion 550 and maintains the amazing portability of the MB2-500. The ultra-light bass amp delivers 500W at 4 ohms, 350W at 8 ohms, and is equipped with an all-tube, 3x12AX7 preamp. The GK MB Fusion bass head also has a 4-band active EQ, variable contour with mid frequency select, and Deep and Bright switches, so you've got total tonal control.

Gallien-Krueger MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head Features:

  • 500W Digital power amp
    All tube preamp (Three 12AX7s) w/ 4-band Active EQ
    Footswitchable Boost w/ Volume control
    Variable contour with mid frequency select
    Deep and Bright switch
    Mute switch
    Active/passive switch (-14dB)
    Effects loop
    Line out, headphone out and Tuner out
    XLR out with pre/post EQ and ground light
    2 Speakon outputs
    Footswitch included


Gallien-Krueger MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head Specifications:

  • 4 lb.


Gallien-Krueger MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head

2 years on electronics and 1 year on speakers.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 2 reviews)
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  • The best lightweight head on the market

    As reviewed by Jerm on 12/11/2010

    Bought this head new and let me tell you, it is one of the best heads on the market. The sounds you can get are awsome, the tube warmth is fantastic on this little head and loud as hell, i have played a 59 p-bass, Jass Bass, Stingray, 4003 Rickenbacker and a Lakeland usa Bass with the heads and i cant get a bad sound with any of these's Basses with the MB Fusion Head. First thing i did after playing live with this head was to sell my Little Mark 3 Head Because i knew i would not use the Little Mark head Again. Just Go Try one of These's heads out for youself. Gk has a winner here People.

    8 of 8 people found this review helpful.
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  • best bass amp i've ever owned

    As reviewed by robert on 9/6/2011

    i have been playing 'forever'. i was very much an SWR fan...until i bought this amp. i own a number of basses but most regularly use my ibanez sr755 and fretless p-bass (when my shoulder isn't sore). i was using a peavey bass amp and, occasionally a line 6 LD150 and running out of headroom. not that we play loud, but the 'beef' was missing and the speakers were starting to flubber. so i borrowed this amp and a schroeder 1512L cabinet. awesome. that's pretty much all i can say. well worth the money, no question. i will be happy with this probably until i go completely deaf :)

    2 of 2 people found this review helpful.
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Questions about the MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head (581055)


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