Bought Martin's ABM 500 EVO II (with cover), and what a great amp it is. It's also in pristine condition, was a bargain, and came with a spare valve and a spare knob, to boot! So that'll come in useful next time I'm invited to a wedding.
Martin is a fine fellow and is most happy to talk bass... and I got to play his acg too, which is a tour-de-force of the luthier's art... all round a very smooth transaction and I'm very much looking forward to pairing the ABM with my Schroeder 21012L. Epic!! Thanks Martin, much appreciated.