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The M-2b (tm) is a two channel, high voltage, transformerless, 100%
Class A biased, all vacuum tube stereo microphone preamplifier
unrivaled in 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.
Highlights
- Transformerless, Fully Class-A, 350 Volt Triode Design
- >35 Dbu Output Headroom
- Optional Dpa +130v Mic Inputs
- Gold Audio Connectors, Tube Sockets, And Relays
- Musically Rich Vintage Vacuum Tubes Available
- Precision Potentiometers, Ultra-Premium Components.
- Effortless, Lifelike Musical Performance At All Dynamic Levels
- Built For Life, Cosmetically Appealing
Specifications
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MINIMUM GAIN
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14 dB
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MAXIMUM GAIN
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50 dB
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FREQUENCY RESPONSE +0 / -3 dB
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4 Hz to 130 kHz
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FREQUENCY RESPONSE, STEREO DEVIATION
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< .10 dB
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NOISE @ 50 dB Gain, 10 Hz - 30 kHz, 150 Ohm Source
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-116 dB EIN
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TOTAL HARMONIC DISTORTION + NOISE, 30 dB Gain, 10 Hz - 20 kHz, +0 dBu Out
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< .02%
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PHASE RESPONSE 35 dB Gain, 20 Hz - 20 kHz, +26 dBu Out
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<10 degrees deviation
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PHASE RESPONSE, STEREO DEVIATION 35 dB Gain, 20 Hz - 40 kHz, +27 dBu Out
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<1 degree deviation
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COMMON MODE REJECTION RATIO 30 dB Gain, 1 kHz, 100 mV C.M.
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Better than 60 dB
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SLEW RATE 30 dB Gain, +27 dBu Out
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>20 Volts per microsecond
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MAXIMUM INPUT LEVEL +20 dB Gain, 20 Hz - 40 kHz (no pad required)
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+20 dBu
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MAXIMUM OUTPUT LEVEL 14 - 50 dB Gain Range, 20 Hz - 40 kHz, Min 10k Ohm Load
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> +35 dBu
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STEREO (INTERCHANNEL) CROSSTALK
30 dB Gain, 1 kHz, +0 dBu Both Outputs
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Better than -70 dB
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INPUT IMPEDANCE, Phantom Input
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3,800 Ohms
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INPUT IMPEDANCE, DPA (B&K) High Voltage Input
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9,000 Ohms
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OUTPUT IMPEDANCE (transformerless vacuum tube)
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120 ohms
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B&K POWERING
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+130 VDC, max, direct (non-phantom) powered
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PHANTOM POWERING
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+48 VDC, +/- 2 VDC
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POWER CONSUMPTION, MAXIMUM
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50 Watts
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POWER REQUIREMENTS
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100/120 - 200/240 VAC selectable, 50/60 Hz
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DIMENSIONS
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19" W x 12" D x 3.5" H
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Unless stated, all measurements are balanced into 100k ohm load on a calibrated Audio Precision System One.
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