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Why won't my mic preamp work on my condenser mic ?

I have an MXL990 mic and I run it through the same stereo microphone preamp that works for my stereo Sony electet mic. Is it because my mic is mono and I need to get the right fittings to go into my stetro preamp ? ...or is it because of my preamp specs ? It was made by a guy that builds them and sells them on eBay: Church Audio ST-20. Here are the specs for the 9-volt driven preamp:

What multi-channel preamp should i get

Hey i'm ordering my new 24" iMac soon than will come the digi 002 rack. I'm just not sure how the multi-channel preamp works with the 002 can anyone sum that up for me? What does it need to have/do? Also which would you recommend on a budget. The guy at my local pro audio store recomended a prosonus one not the firepod but another one that was 1300 bucks which is way to high for me.