I have a late-90s SM-900 unit that I'm looking to sell. I love the unit and the sound, but I just don't need this much power these days, and am looking to simplify and lighten by rig. Aaaand I could use the cash for medical school. I've recently had it refurbished by Paul Morte Technical Services in southern California. They are one of the top amp service companies in the US. I shipped the unit down to them to fix a difficult-to-diagnose hum, and had them pour through the amp to make sure that everything was in perfect shape electronically. It now works perfectly and sounds brand new. The unit itself definitely has some wear, however, from the prior owner. Functionally it is perfect, but is not cosmetically the most beautiful (but it isn't that bad, but I want to be up front!). I'm looking for only $550 + half shipping. If you are in the bay area, you are welcome to swing by and try it out. I'd do $500 flat for a local sale I'll get pictures tomorrow when I have some natural light. Thanks!