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MF MD HG PlugPlay guitars ampseffects 05-26-15
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Gallien-Krueger Logo
SKU 
581055 000000000

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 th...Read More

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  • MSRP:
    $999.00
  • Your Savings:
    - $300.00
  • Shipping (48 Contiguous U.S. States)
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  • Your Price:
    $69900

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OVERVIEW

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.

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

Get portable, powerful tone that goes wherever your sound takes you—add the MB Fusion to the cart now.

SPECIFICATIONS

MB Fusion 500W Tube Preamp Ultra Light Bass Amp Head

  • 4 lb.

    TC Electronic Videos

  • MB Fusion 500 IzfSyJ8g658
Reviews
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Review Snapshot®

by PowerReviews
Gallien-KruegerMB Fusion 500W Tube Preamp Ultra Light Bass Amp Head
 
4.8

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (4)
  • Excellent sound (4)
  • Portable (4)
  • Warm / comfy (4)
  • Good power output (3)

Cons

    Best Uses

    • Performances (4)
      • Reviewer Profile:
      • Experienced (4)

    Reviewed by 10 customers

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    Displaying reviews 1-10

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    (2 of 2 customers found this review helpful)

     
    4.0

    Great Little Amp - BUT

    By Tunewriter

    from Maryland

    About Me Experienced

    Ask me a question

    Pros

    • Easy To Use
    • Excellent Sound
    • Good Tone
    • Good Warmth
    • Portable
    • Very light weight
    • Very Powerfull
    • Very Small Size

    Cons

    • No Clipping Led

    Best Uses

    • Performances

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

    I was looking for a quality light weight Bass Amp and I found one in the GK MB500. Having said that, I feel it is inexcusable for an AMP of this quality and price point to not have a clipping LED. My sound engineer was beside himself when I 1st showed it to him and he could not find one. Asside from the missing LED, there is a, somewhat, loud internal cooling fan that turns on once a certain temp has been reached. It's Louder than any PC cooling fan I've ever heard. This presents no problem for performing live but don't try recording with it in a studio with a mike. The fan will be heard in the recording. The addition of a clipping LED and a quieter cooling fan would make this AMP a 10 out of a 10.

    Comment on this review

    (3 of 3 customers found this review helpful)

     
    5.0

    Probably all you will ever need

    By Florida basement dude

    from Florida panhandle

    About Me Experienced

    Pros

    • Easy To Use
    • Excellent Sound
    • Good Warmth
    • Headphone Out
    • Portable
    • Powerful

    Cons

      Best Uses

      • Events
      • Mobile DJ
      • Performances
      • Professional Recording

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

      Size: It's less than 4 lbs. Small: like three Ipads stacked. Loud: 350 watts @ 8 Ohm, 500 watts @ 4 Ohm. Versatile: Footswitch between clean and tube sound. Three tubes in the preamp give you the tube sound; warm, fuzzy, gritty, whatever you choose. The standard GK 4-band EQ is the one you really don't need to use - it sounds great when all the dials are at noon. Contour mid-point can be moved from 500 Hz to 800 Hz. Base boost and bright switches are on the top of the amp. The limiter switch is also on top, which is why some reviews say this amp doesn't have it. It does. Supplied footswitch cable is about 10 feet long. I use the GK 212 II NEO cab, which is rated at 600 watts at 8 Ohm. It's plenty loud but can handle the lows very nicely also. It's nice to hear what you are really getting through the headphones during practice. This is probably the most amp I will ever need. I should add something about delivery. I ordered this on Friday evening on the President's Day weekend. It was here in FLorida on Tuesday morning at 10am. Great service MF.

      Comment on this review

      (5 of 5 customers found this review helpful)

       
      5.0

      Excellent when paired the the GK 212

      By Florida basement dude

      from Florida panhandle

      About Me Experienced

      Pros

      • Easy To Use
      • Excellent Sound
      • Good Warmth
      • Portable
      • Powerful

      Cons

        Best Uses

        • Amateur Recording
        • Events
        • Home Studio
        • Performances

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

        I pair this with a new GK 212-II NEO cab rated at 600 watts at 8 ohm. This head at 8 ohm puts out 350 watts. I can always add a second cab to get the full 500 watts. I set channel A gain around 9 o'clock and the master around noon. Then set channel B gain around 3 o'clock and the master around 11 o'clock. That creates a super clean sound in channel A and a warm fudgy tubey sound in channel B. Headphone out for practice. Pre/post DI out. EFX in/out. Footswitch for channel changing. Limiter off/on. Deep bass off/on, bright treble off/on. You can set scoop mid-point at either 300 Hz or 800 Hz on the contour. Less than 5 lbs. If you own or plan to get one of the GK powered cabs, you can plug it directly into this head. If you pair one with the GK212-II NEO you cannot use the bi-amp feature built into the cab. So be sure to get the correct speakon connecting cable. If you purchased the NEO cab new you CAN use the speakon connecting cable that comes with that speaker. You can also use an old style 1/4 inch cable. The footswitch comes with a long cable - maybe 6-8 feet? I don't have a ruler so I'm guessing. You can practice with headphones (use the 1/4 inch plug) without having any speakers connected, which makes practice when traveling easy. This will fit into my gig bag but I will probably purchase a fitted bag made for it to protect it. Other than that this is a keeper and easy to learn and use.

        Comment on this review

        (35 of 35 customers found this review helpful)

         
        5.0

        This Head Rocks

        By RockinRick

        from Shingle Springs Ca

        About Me Experienced

        Verified Buyer

        Pros

        • Easy To Use
        • Excellent Sound
        • Good Warmth
        • Portable
        • Powerful

        Cons

          Best Uses

          • Amateur Recording
          • Performances
          • Rock-blues-just Play

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

          Im older (62) yes OLD and been playing a long time.Still have the Ampeg but wanted something lighter.....This is my 2nd GK head and I love it.
          Tube preamp- plenty of power...SUPER lite.....what more could you ask for....PERIOD

          Comment on this review

          (2 of 25 customers found this review helpful)

           
          5.0

          GK MB Fusion 500W Amp

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

          I would recommend the amp, but I still need to see how well it holds up over time.
          Nice features, but I can't give it a 10 because it doesn't have a clip light or a limiter/compression feature.
          I've only used it once so far, but it sounded great and it held up fine for a 4 hour gig. Bought it as a back up for my Mesa Boogie M-Pulse 600.
          Fair price for what you get.

          Comment on this review

          (10 of 39 customers found this review helpful)

           
          4.0

          GK MBFusion

          By jon heake

          from chandler az

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

          I bought this amp ( MB Fusion ) a around the 18th of Nov, its now 21 dec and i have returned it. Here's my reason why though. It sounds great, is very loud, has super bass responce, and every feature is very useable on this amp. I returned it simply because the tone wasn't exactly what i was looking for. I had never used GK before so i was kind of taking a gamble, and with MF's great return policy i figured, hey why not? Its no fault of GK though. It was me. However, It was missing a couple features i usually like in an amp(on board-compressor and a clip indicator led). The 2 channels with the provided foot switch was really a nice touch and the tubes in this amp really give it a nice warm sound.

          So all in all, if Gk is the tone you love then pick up this amp. It really is a great little amp and I almost kept it even though it wasnt really the tone i was after. Like I said though, great product and i highly recomend it. Unless you are like me and generally dislike Flea's tone. Gk amps sound like him, or rather, he sounds like GK.
          I would have given it a 10 if it had an on board compressor and a clip indicator light.
          very well built, the pots were nice and smooth and all of the buttons seemed tight and not loose.
          I think the head is a little pricey for its power rating but its still a very good buy.

          Comment on this review

          (53 of 54 customers found this review helpful)

           
          5.0

          Thank You GK

          By Patrick Burns

          from Washington DC area

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

          Overall I simply can not find fault with this product. As a profession musician paying my bills with my bass, it's really hard to find fault in a fully functional, beautifully made, and super light-weight amp, which comfortably sits in my backpack. I use a 8 ohm Hartke XL series 2x10 and run a Source Audio BEF, Snarling Dog Bootzilla Wah and a Digitech Jamman (through effects loop) with phenom sound and tone. The "Deep" and "Presence" filters are exceptional additions to the GK's tone shaping super-powers. Additionally using the included pedal to swap between channels it is easy to dial in a overdriven tube tone in channel B and swap on the fly for solo moments or stand out moments.
          Two Channels, included quality footswitch (and cable), tones of tone sculpting ability, a clear and well written owners manual, intuitive design, and four pounds! Amazing. The features are better than advertised.
          I have never owned anything from GK before and this is an outstanding introduction to their product line, however, since the product comes prepared for rack mount system and at this price it seems like a rack mounting system should have been included. A local music shop told me NOT to rack mount the system as the tubes heat will become an issue...but then that begs the question of why does it come prepared for a rack system?
          Just based on size, portablility, and most importantly TONE this bass amp is simply unbelievable. I regret waiting this long to get a light weight amp. I can't believe I lugged around a 45lbs box for the last 5 years when I didn't need to! I feel like at the price this is a bit pricey and definitely made me think a while before dropping the coin, however, now that I own it I am kicking myself for waiting!

          Comment on this review

          (49 of 51 customers found this review helpful)

           
          5.0

          The Buck Stops Here!!!!

          By *TheEdge*

          from Ypsilanti, MI

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

          If you're looking for a light weight, full featured, powerful amp for your rig, look no further. This GK MB Fusion has got to be the best thing in it's class. The tone is amazing. Very good choice of EQ bands. The 350watts @ 8ohms drives my Eden 410XST very well. Haven't tried it at 500watts (will probably never need it). The tube preamp (3 tubes) sound is very warm and you can set the B-gain/B-Master get a good tube distortion and switch between the A and B sides. This thing rocks. I've been an Eden owner since '95, this is my first GK amp. I'm glad I didn't choose the Eden WTX series or Markbass light weights. I play all types of music, Jazz, R&B, Classic Rock, Metal, Pop. This Mb Fusion will fill the job well.

          Comment on this review

          (58 of 59 customers found this review helpful)

           
          5.0

          These Are HOT

          By Basses & Bulldogs

          from Caledonia Wisc.

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

          This is my first G-K bass amp. I took delivery on this wonderful little piece of gear about 3 weeks ago. I was very anxious to try it out on two back to back weekend gigs - one being a 3 piece blues band in a local club with one 4 ohm eden 212xlt and the next gig with a 9 piece band in a large classic hall with my 4 ohm 6-10 Goliath Senior. I would usually bring a Ampeg SVT-3 Pro to both of these jobs and a Carl Martin Compressor/Limiter box that loads pre amp tubes well for Great sustain at any volume. I played a custom black warmoth J Bass for the blues gig. In the larger hall a newer RIC 4003 and amber Contemporary series Hofner violin Bass. I found no issues with the power cord or the supplied footswitch.The MB Fusion was a bit pricey but now I know the whole story. I really was amazed at how much punch this little book sized amp has. I got compliments at both jobs from band members and friends. The 2 volume - 2 master volumes set-up is great w/footswitch for pre-set boost or solo. The MB Fusion pumps out a solid 500 watts/4 ohms and 4 very usable bands of EQ. It has alot of the sound I was used to with the Ampeg. At 4 1/2 lbs. It fits right in my Anvil briefcase. Do not let the size of this bass head keep you from buying one of these. In my 44 Yrs.of bass playing this is a milestone type product - I'm very excited to have one and want to push those 3 pre amp tubes again as soon as I can.

          Comment on this review

          (43 of 45 customers found this review helpful)

           
          5.0

          Amazing

          By porksoda6

          from Bay Area

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

          It's a truly amazing, powerful,ultra portable little unit at only 4lbs! Yes, that's right Four pounds! GK quality and reliability! I highly recommend it! It Rocks!

          Comment on this review

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