Dual Pattern Stereo Electret Microphone System 33-919. Found it at a thrift store in good shape. If this is, indeed, a condenser (which is the claim on the box), it needs phantom power, and my preamp only takes XLR connectors for a condensor mike. My thoughts are to sell this, but would like to make sure it works before I put it up. I guess the only way to check it is to convert the 1/4" jacks to XLR, which I've never done before (never had a condenser that had a 1/4" jack). Is that correct?