M-2b Two Channel Transformerless Vacuum Tube Microphone Preamplifiers

The M-2B Stereo Vacuum Tube Microphone Preamplifier from Millennia is a 2-channel, high voltage, transformerless, 100% Class-A biased design unrivaled in delivering the essential nature of triode musicality. The M-2B imparts to recorded material a heightened sense of ambience and euphonic space, a subtle but enhanced musical sweetness, and a particular quality of intimacy not normally associated with solid-state designs.

"Still mesmerized each time we listen to this thing - the more we do with it, the more harmonics jump outta this thing! And it isn’t even broken IN yet! It’s just absolute insanity...compliments to the chef." -Ira Segall

The World’s Most Elegant Tube Mic Preamplifier

• Musical, involving, euphonic
• High speed transformerless, pure Class A, 350 volt triode design
• Differential topology: no attenuator “pads” required
• Effortless dynamics, vividly realistic ambience
• >35 dBu output headroom
• High resolution gain control
• Precision potentiometers, ultra-premium components
• Built for critical professional applications
• Gold audio connectors, tube sockets, and relays
• 3/8“ thick radius extruded aluminum face plate
• Durable mirror-gloss anodized finish
• Mil spec 16 gauge cold-rolled steel chassis
• Ultra-clean toroid power supply: internal sub-chassis
• Hand machined aluminum knobs, illuminated IT&T push buttons
• Richly musical vintage vacuum tubes available
• Mogami Neglex OFC audio wiring
• Silver Teflon power wiring

Options

• BK (DPA) +130V mic inputs
• DC inputs for ideal performance with dynamic and ribbon microphones

Specifications

• Minimum Gain: 14 dB
• Maximum Gai: (3 ranges with continuous trim), 50 dB
• Frequency Response: +0 / -3 dB, 4 Hz to 130 kHz
• Noise: 50 dB Gain, 10 Hz - 30 kHz, 150 ohm Source, -116 dB EIN
• Total Harmonic Distortion + Noise: 30 dB Gain, 10 Hz - 20 kHz Bandwidth, 0 dBu Out, < .02%
• Intermodulation Distortion:(50 Hz & 7 kHz) 35 dB Gain, +27 dBu Out < .0009%
• Phase Response: 35 dB Gain, 20 Hz - 20 kHz, +26 dBu Out, < 10 degrees deviation
• Phase Response, Stereo Deviation: 35 dB Gain, 20 Hz - 40 kHz, +27 dBu Out, < 1 degree
• Common Mode Rejection Ratio: 30 dB Gain, 1 kHz, 100 mV C.M., > 60 dB
• Slew Rate: 35 dB Gain, +27 dBu Out, > 20 Volts per microsecond
• Maximum Input Level: 20 Hz - 40 kHz, 14 dB Gain, +20 dBu (no attenuator pads required)
• Maximum Output Level: 20 Hz - 40 kHz, 10 kilohm Min. Load, > +35 dBu
• Interchannel Crosstalk: 30 dB Gain, 1 kHz, 0 dBu Both Outputs, < 70 dB
• Phantom Input Impedance: 3.800 ohms
• Output Impedance: 120 ohms
• DPA (B&K) Mic Powering: +130 V dc max, (non-phantom)
• Phantom Powering: +48 V dc, +/- 2 V dc
• Power Consumption: 50 watts maximum
• Power Requirements: Selectable: 100-120, 200-240 V ac, 50/60 Hz Dimensions/Shipping Weight 19” W x 3.5” H x 12” D, 26 lbs..