Gallien Krueger MB Fusion amplifier - pre-owned inc box :: Bass Direct :: For sale, Offer, UK, EU, Warwick Second Hand and Ex-demo Amplification Stock :: USA Birmingham, London, Manchester


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Gallien Krueger MB Fusion 800 - pre-owned inc gig bag

£650 + £10 UK shipping

  1. Please contact the shop to pay by Bank Transfer

  2. Used amp in immaculate condition, with gig bag. List new £989

  3. Click on images to enlarge.

Tel: 01926 886433


Infusing the power and punch of the MB 800 with the rich, warm tube sounds of the Fusion 550 Gallien Krueger have create a bass head amp that has it all. Introducing the MB Fusion 800. Delivering 800 watts of power across three 12AX7 tubes this amp has all the tone shaping capabilities and power that GK is known. Not only that but there's two footswitchable gain and master volume controls alongside other professional additions such as speakON connectors, tuner out, DI and an effects loop. Weighing in at incredible 5.5lbs this little powerhouse is small and light enough to carry around in your gig bag making the MB Fusion 800 ideal for pros and hobbyists alike.

All tube preamp, true GK punch

MB Series Heads offer optimum performance while remaining light weight and small enough to fit in the pouch of an average gig bag. All heads feature aluminum enclosures, digital power supplies and power amplifiers as well as unique signal management circuitry, allowing them to deliver high volume while retaining punch and dynamics. Available models range from 200 watts to 800 watts and are available with a variety of solid state, all tube and discrete F.E.T. preamps.


Feather Weight
With its switch mode power supply and Aluminum chassis, the MB Fusion 800 weighs in at only 5.5 lbs. (2.5kg)

Illuminated knobs and switches show the amplifier's state at a glance, even on the darkest stages.

Smart Knobs
Push-push knobs are used to select multiple voicing, channel and limiter options, the knob indicator color indicates the operation mode.

Tube Warmth
Three 12AX7 tubes deliver the perfect blend of classic response and the timeless 'Variable Q' equalizer design from the 800RB.

Dual Channel Flexibility
Foot switchable channel switching for on the fly volume boost or additional grind.

Balanced DI with Pre/Post and Ground Lift switches to feed the house, Foot Switch Jack, Tuner output, FX Loop for connecting outboard accessories, Headphone Output for silent practice, Line Out plus “Chain Out” to drive GK’s MBP powered cabinets. Two twist lock speaker connectors ensure reliable and safe cabinet connections.


High Voltage Tubes
The signal path for gain, EQ, contour and the DI are 100% tube driven, achieving clasic tube performance with 300V plates.

Variable Q Tube Equalizer
Inherited from the 800RB, this unique tube design varies the EQ bandwidth to retain a musical response even at extreme settings.

High Tech Power
Switch mode power amp and supply deliver a crushing 800 Watts of cool running power.

Intelligent Cooling
Temperature controlled fans keep the amplifier cool delivering only the required amount of air, reducing noise and dust intake.

Thoughtful handle design protects the front panel controls. Internal circuitry indicates problems on the power switch ring. Blue is good!


  1. Power: 800 Watts @4Ω

  2. Dimensions: 10.75 x 12.25 x 1.75"

  3. Weight: 5.5lbs

  4. Preamp: Three Tube 12AX7 300V Plate