Gives you an all-tube preamp, 4-band EQ, and 500W of power.

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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 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.

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