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Information

The M-2b is a two channel, high voltage, transformerless, 100% Class A biased, all vacuum tube stereo microphone preamplifier delivering the essential nature of triode musicality.

The advanced M-2b circuits employ differential topologies, ultra-high headroom, electrically correct transformerless coupling, high voltage rails, hand-selected componentry, unfailing attention to power and ground integrity, and much more.

Why a vacuum tube mic preamplifier All audio circuits, regardless of topology, whether tube or solid state, impart some coloration. In all topologies, Millennia seeks to minimize circuit-induced artifacts while retaining as much original sonic information as possible at the output. Nevertheless, even in these refined tube and solid-state topologies, there remain subtle sonic distinctions. If we were to subjectively characterize our vacuum tube topologies, some descriptions which come to mind include a heightened sense of ambience and "euphonic space," a subtle but enhanced musical "sweetness," and a particular quality of "intimacy" not normally associated with our solid-state designs. By contrast, one might say that Millennia's range of semiconductor products (HV-3, Mixing Suite, TT-FET paths, etc.) present a tactile, acoustically lifelike rendition of even the most difficult and complex spectra, exceptional dynamic stability, and superior objective performance in areas of THD, common mode rejection, noise, frequency response, and output drive capability.

Alas, both Millennia design topologies (vacuum tube and solid state) offer incredible realism, yet each technique approaches accuracy from a different sonic direction. Vacuum tubes offer audio performance which semiconductors cannot. Semiconductors offer audio performance which vacuum tubes cannot. Both have a significant and complimentary role in professional audio. Millennia now makes available the finest in both worlds.

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

  • 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
  • Specifications

    Minimum Gain
    14 dB

    Maximum Gain (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.
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