No sound from phono preamp

I just set up a VPI Super Scoutmaster turntable with JMW-9 arm connected with Nordost Heimdall cables to the phono stage. It works great with the phono stage in my preamp, but when I connect the arm to my stand alone phono pre (RCM), there is only hum but no sound. The RCM works like a charm with my other turntable. Any suggestions what that could be and how to address it? Thanks!