EA Pro Audio

M-2b Two Channel Vacuum Tube Microphone Preamplifier

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  • Regular price R 47,452.20


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..