M-2b Two Channel
Transformerless Vacuum
Tube Microphone
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
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..
Awards

The sound is great -- sweet, refined, full of dynamics - fabulous on grand piano.
Tony Faulkner, Greenroom Productions, UK owner of HV-3D and M-2B preamplifiers

Guitar, violin, flutes and other instruments in stereo array with Schoeps sound so pure, sweet and spacey. I especially love the tube preamp (M-2b) with the transformer engaged
sometimes. Really a happy day and hopefully many happy days yet to come... It was preceded by two months of communication with Millennia and John La Grou - and he was so kind to me, answering all possible questions
and being extremely helpful.
I. Solace [in the George Massenburg Forum,
6 Oct 2003]

This is an outstanding mic preamp. I’ve never heard our mics sound this clean on piano. We’ve been using our [46 channels of] Millennia preamps on everything...
Jack Renner, President, Telarc Records International

A couple of experienced recording engineers here in DC thought my combination of Schoeps m222b tube mic and M-2b preamp was the greatest front end they had ever heard.
Steve Cormier

“The M-2b is an audio masterpiece. Tube technology at it’s finest- which in my book means audio technology at it’s finest! Our first choice for vocals and piano. If we owned
more channels, the M-2b would probably be first-choice on everything until we ran out of them! Like everything from John La Grou’s workbench, the M-2b is built like a fine watch. A pleasure to hear, see, and touch.”
Randy Ezratty, Effanel Music, Inc.

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