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

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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 a... Read More

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  • Pro Coverage Eligible
    Pro Coverage Eligible Pro Coverage will repair or replace your gear quickly and get you back playing, gigging and recording as fast as possible-even accidental damage from drops or spills is covered.
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    Easy Returns If you're not happy with your purchase, we give you 30 days to return it for a full refund or exchange.

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.

  • 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
  • 4 lb.
2 years on electronics and 1 year on speakers.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

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 three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews


by PowerReviews

(based on 2 reviews)

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Reviewed by 2 customers

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(2 of 2 customers found this review helpful)


best bass amp i've ever owned

By robert

from santa clarita, ca

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 :)

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(8 of 8 customers found this review helpful)


The best lightweight head on the market

By Jerm

from Hamilton, Ontario

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.

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