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The MXL 990 is a small-diaphragm, fixed-cardioid, transformerless FET condenser with an externally-biased 17mm gold diaphragm (in a 22mm-diameter capsule). 990 filing The circuit is MXL’s version of the famous Schoeps transformerless circuit, which uses a FET input and a pair of bipolar transistors to produce a balanced output without a transformer