Henk, I think you confuse me with the original poster whose MDX2OOO was broken. My MDX2OOO works fine, no problem. The only thin I did to it was exchange a couple of those 100n ceramics (local bypass caps) for Wima MKS-2, mostly for sound reasons. The MDX2OOO has many of those, though, and I got tired of it. The double sided PCB is pretty sensitive to heat. Pads tend to come off when you de-solder and re-solder stuff. I know you can't take out the big PSU electrolytics, I never had intentions to do so. I would like to exchange them for bigger ones, but they're glued to the PCB, and I don't know if I can find larger ones that would fit. At 2200 µ they're probably sufficient, anyway.
I know how to take apart B*hringer gear; in fact I do on a regular basis and have developed a routine. By now I could do it in the dark. Still, I have litte hope that I will be able to take out SSM replacement board without damaging it. I mean, if it's just for curiosity's sake, I'm not gonna take risks. I'm not sure anyone actually wants to rebuild this SSM replacement board. For new designs, the THAT 2252 is probably a better RMS detector chip to go with the THAT VCAs, anyway. From what I read on the web, the obsolete SSM chip must have been a difficult bastard. THAT has a design note on replacing the SSM2120 level detector, if you're interested: http://www.thatcorp.com/datashts/dn126.pdf