M-2b
Two Channel Vacuum Tube Microphone Preamplifier
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
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%
Inter-modulation 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
- 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..