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

Item #: 
1273888005341
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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... Click To Read More About This Product

Price:
$6990.00
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Overview

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
  • 500 watts @ 4 ohms, 350 watts @ 8 ohms
  • All tube preamp (Three 12AX7s)
  • 4-band Active EQ
  • Variable contour with mid frequency select
  • Deep and Bright switch
  • Mute switch
  • Active/passive switch (-14dB)
  • Effects loop
  • Tuner out
  • XLR out with pre/post EQ and ground light
  • 2 Speakon outputs
  • 4 lb.
Specifications
  • 4 lb.
Warranty
MANUFACTURER'S WARRANTY
2 years on electronics and 1 year on speakers.


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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
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  • Repair costs covered for up to three years from date of purchase
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  • Customer Reviews
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Review Snapshot

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

(based on 16 reviews)

Ratings Distribution

  • 5 Stars

     

    (13)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (7)
  • Excellent sound (7)
  • Portable (7)
  • Warm / comfy (7)
  • Good power output (6)

Cons

No Cons

Best Uses

  • Performances (6)
    • Reviewer Profile:
    • Experienced (5)

Most Liked Positive Review

 

These Are HOT

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...Read complete review

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.

VS

Most Liked Negative Review

 

GK MB Fusion

Having used a multitude of bass heads over the past 40 plus years, and having to wait on this to come out for almost two years since its announcement , I can truly say...Read complete review

Having used a multitude of bass heads over the past 40 plus years, and having to wait on this to come out for almost two years since its announcement , I can truly say it was worth the wait.
The warmth and punch of this mini is unreal, and compared to My 80 pound all tube Head, I prefer the unique GK sound, (very smooth, to very gutsy) and has all the control you could possibly need.
Outstanding!

Reviewed by 16 customers

Displaying reviews 1-10

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5.0

Fills the bill.

By Bruce W

from Payson, AZ

About Me Professional Musician

Verified Buyer

Pros

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

Cons

    Best Uses

    • Performances

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

    This GK amp delievers a warm tube sound and plenty of punch without the weight of the old school tube amps.

     
    5.0

    Heavy in Power/Tone, but Light in Weight

    By The Bass is TOO Loud!!

    from Sacramento

    About Me Experienced

    Verified Buyer

    Pros

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

    Cons

      Best Uses

      • Performances

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

      I run the MB Fusion 500 through GK Generation One 2X12 and 1X12 cabinets, or two 1X12 cabinets, and that combination rules the stage; indoors or out. The three 12AX7 tube preamp on the MB Fusion 500 provides the warmth that a pure solid state head wishes it could have. The power behind 500 watts is more than enough to meet my needs, but it's a blast to hear (and feel) when it is unleashed with three 12 inch drivers. Cannot get a bad sound out of any my basses (Fender, Rick, Yamaha, Gibson or Epi Elitist). GK is a great company that will stand by their products, and its customers.

      (5 of 5 customers found this review helpful)

       
      5.0

      size doesnt matter hehe

      By charcoal11

      from hongkong

      Pros

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

      Cons

        Best Uses

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

          This little thing was introduce by my bassfriend, that time im looking for a portable and affordable head for my hartke cab cause the original head was damage for overused and no time to fixed it, it cost a lot of money, thats why i decide to buy one, i thank to my bassfriend for this one, first time i try, wooo its blow me away, its so powerful and its punchy the mids are awesome and the good thing i can carry everygig.
          I recommend this mb fusion 500 for all gig musician out there, check this little thing i promise you this wont let you down.

          (4 of 8 customers found this review helpful)

           
          4.0

          Great Little Amp - BUT

          By Tunewriter

          from Maryland

          About Me Experienced

          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.

          (10 of 10 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.

            (14 of 14 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.

              (45 of 45 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

                (2 of 35 customers found this review helpful)

                 
                5.0

                GK MB Fusion 500W Amp

                By gus talavera

                from LA

                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.

                (10 of 49 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.

                (3 of 3 customers found this review helpful)

                 
                5.0

                best bass amp i've ever owned

                By robert

                from santa clarita, ca

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

                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 :)

                Displaying reviews 1-10

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