Up for trade is my GK MB2 500 version A07, which was the final revision before the name was changed to MB 500. The amp is in like new condition and has performed flawlessly since the day it was purchased new. Comes complete with foot switch and original packaging. The only trade I would be interested in would be for an Aguilar TH500, with cash from my end of course. I will consider an outright sale, but would rather trade. The MB2 500 is a great micro amp with tons of headroom and a great eq section. You will not be disappointed with this amp.