I have an old marshall 3540 and was wondering what it might be worth.cosmeticlly its o.k,about a 5 on a 1-10 scale..functionally its a 10..yes I did a search and came up empty,I even looked on the bay,and theres not a 3540 to be found..the amp was known as the 400 watt intregated bass system..3 space rackmount,bi-ampable(2x200w amps) controls for sensitivity(gain),contour(kinda like a e.q. pre-shape),5 band e.q. ,boost function(foot switchable),crossover freq. ,bass vol., treb vol...I do not have the footswitch for it..any idea what its worth???