Barely used. Works great with that classic clear GK tone and is louder than you could imagine for the weight and size.
Comes with manual, power cable and footswitch. I can throw in a custom speakon cable as well.
$450
Here's the description from the web:
Weighing in at fewer than 4 lb. and taking up less than one rackspace, the MB500 delivers 500W of signature GK tone in a sleek, compact, modern head. Boasting GK's legendary 4-band active EQ and contour control, the MB500 lets you tweak your tone to perfection before hitting the digital power section.
In addition to its generous tone-shaping capabilities, the preamp section has a footswitchable boost channel with independent volume control to dial in just the right amount of grind and level boost when needed.
The MB500 is stage- and studio-ready with an XLR direct out with pre-/post-EQ selector and ground lift. Also offers a tuner out with mute, FX loop, headphone/line out, and dual Speakon outputs.
Features
500W @ 4 ohms, 350W @ 8 ohms
Digital power amp
4-band active EQ with contour switch
Footswitchable boost channel
Effects loop
Tuner out with mute
-10dB pad for active instruments
XLR out with pre-/post- EQ and ground lift switch
Two Speakon outputs
Headphone/line out
Footswitch included