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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: