From Universal Audio:

• Based on Legendary Bill Putnam 610 Tube Mic Pre and EQ Used on Countless Classic Recordings
• Authentic Teletronix LA-2A-style T4 Opto-Compressor
• Complete vintage channel-strip at groundbreaking price within project studio reach
• Mic Pre with Gain and Level controls, variable impedance switching, and Instrument DI for recording tone “colorâ€
• Mk II Features such as True Bypass, Larger Metering and Improved Signal Output
• UA build quality and heritage, audiophile components, hand-assembled in the USA

MK II Improvements

• True Bypass of the Compressor Circuit
• Larger and Better Lit Metering
• Improved Output Signal Performance
• Auto-Sensing Universal Power Supply
• Improved stability with feedback-style shelving EQ
• Improved consistency with Input Gain values
• LED Jewel Light Never Needs Replacing

Specifications:

• Mic, Line and Hi-Z Input, Line Output
• Dual Impedance Mic and Hi-Z inputs (Mic: 2K, 500?, Hi-Z: 2.2M, 47K?)
• 5 position Stepped Preamp Input Gain, Continuous Preamp Output Level
• -15 dB Pad Switch (15 dB Pad/Off)
• Phase reverse (0/180ÅŸ)
• 48 volt Phantom Power switch (+48v/Off)
• ±9 dB stepped High Shelving Filter (4.5, 7, 10 kHz)
• ±9 dB stepped Low Shelving Filter (70, 100, 200 Hz)
• T4 Optical Compressor with Continuous Peak Reduction and Makeup Gain
• Compress/Limit/Bypass Modes of Dynamic Operation (3:1 / ?: 1)
• Meter Source Selector Switch (Preamp/Gain Reduction/Compressor)
• Front Panel Power switch (On/Off)
• Custom Altran and Cinemag Transformers