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Multi-Voice Tube Preamplifier




The Solo MPA Multi-Voice Tube Preamplifier allows users to blend between a pristine low-noise/low-distortion solid-state transistor circuit and a warmer Class-A tube mic preamp.

The flexible EQ controls allow users to voice the Solo MPA to create their signature sound. Featuring 48V phantom power and a variable input impedance control, users can tailor the Solo MPA to suit their microphone of choice, be it a high-quality dynamic, a studio-grade condenser, or a low-level ribbon

The Solo Series of single-channel rackmount units have been developed for the recording enthusiast with a preference for simplicity.

Key Features

  • Adjustable input impedance (600 to 80K ohms)
  • Hand selected 12AX7 tube
  • Flexible Tilt EQ
  • Tunable Lowcut Filter
  • Variable Voice Tube/Solid State Control
  • Front accessible meter trim
  • Discrete class A FET input microphone preamplifier
  • Low THD
  • Wide frequency response
  • Front mounted Instrument/DI Input
  • Very high input impedance
  • +4dBu/-10dBV output level selection


Frequency Response 15 Hz to 50 kHz (+0, -1dB)
Dynamic range >110dB (“A” weighted)
CMRR >90dB THD <0.005% (typical
Equivalent Input Noise -129dBu (XLR, “A” weighted)
Maximum Input Level +19dBu (XLR)
Maximum Instrument Input +17dBu
Input Impedance 600-80K ohms adjustable (XLR), >800k ohms (Instrument), +27dBu (XLR)
Output Impedance < 47 ohms (XLR)
Maximum Gain 75dB
Meter Calibration 0VU = +4dBu output (+4dBu mode) 0VU = -10dBV output (-10dBV mode)
Low Cut Filter Single pole,10-200Hz adjustable
Tilt EQ


+/- 12dB adjustable
Power Requirements 100-120V 60 Hz / 220-240V 50Hz
Dimensions: (HxWxD) 4.45 cm x 48.3 cm x 15.2 cm
Weight 2.5kg
Box Dimensions (HxWxD) 12.6 cm x 51.8cm x 18.9cm

Note: 0 dBu = 0.775Vrms


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