One of my favorites of all time, my MB TA 503 for sale. It's in a rack for a long time now, but in perfect condition.
Tube preamp, 4 parametric eq (if you do a lot of small-club gigs you know how important it is), including the famous MB filters, this has been one of the premium models of Markbass in the last years. Fantastic sound, lots of power (500W). I used to have other MB stuff, like LMII, SA450, but this one is really better soundwise due to the tubes.
590 EUR including shipping to the EU. Paypal preferred. 
