501T Mic Pre with Transformers is a 500-series transformer-balanced microphone preamplifier with transformer-balanced input and output stages. It provides a wide, stepless gain range from 32 dB to 78 dB, a +24 dBu floating output, and LED peak metering. Features include switchable phantom power, a 75 Hz high-pass filter, and a polarity reverse switch. Hand-selected UK transformers deliver isolation and low noise for studio and location recordings.