ART TUBE MP/C Microphone Preamp

The Tube MP/C (PreAmplifier/Compressor) from ART is a multi-purpose tool for audio engineering and recording. Two independent circuits featuring a tube-based analog preamplifier and a VCA-less compressor with optical gain reduction control are housed in one, convenient desk-top chassis.

Used as a mic/line preamp or as a DI (direct) box, the Tube MP/C is designed to work seamlessly with any recording, sound-reinforcement, or electronic instrument setup. A R T’s Tube MP/C circuitry is a hybrid design utilizing the latest, most advanced, solid-state and tube technology.

The preamplifier’s active balanced solid-state input provides extremely low noise and excellent common mode rejection. The ¼-inch high impedance input prevents loading of any connected device making the Tube MP/C perfect for DI or line level applications. The preamplifier’s second stage 12AX7a tube runs on a regulated DC voltage providing an additional 20dB of gain.

The compression circuit features a VCA-less design and utilizes optical electronics (Vactrol) coupled with a 12AX7a vacuum tube gain stage for superior musical performance.

ART TUBE MP/C Features

• Tube-based mic/line preamplifier with up to 80 dB of gain
• Hand-selected 12AX7a tube
• Optical (VCA-less) compressor circuitry = transparent dynamics control
• 1/4-inch unbalanced inputs and outputs
• XLR balanced inputs and outputs
• Transformer isolated XLR output
• Selectable output range for Line/Instrument interface levels
• LED meters for Tube Warmth, Gain Reduction and Output level
• +48V phantom power
• Phase reversal switch
• Selectable release time settings
• > 90dB dynamic range
• Custom extruded aluminum chassis

• TUBE MP/C microphone preamp1
• Three Year Limited Warranty1

• Frequency Response 30Hz–60kHz +/- 1 dB balanced output, 20Hz–60kHz +/- 1dB 1/4″ output
• THD <0.1% @ max gain
• CMRR >60 dB @ max gain
• Equivalent Input Noise -128dBu typical (“A” wtd., Shorted XLR balanced input, gain @max)
• Input Impedance 1M Ω 1/4″ input, 5K Ω XLR input
• Input/Output Connections
  • Input: XLR balanced or 1/4″ balanced
  • Output: 1/4″ unbalanced XLR balanced, transformer isolated
• Maximum Gain+80 dB (balanced in-out, +64dB (unbalanced input, balanced output)
• Maximum Input Level
  • Unbalanced (Inst): +15dBu
  • Balanced (mic): +10dBu
• Maximum Output Level +19dBu (Line mode)
• Output Impedance XLR: <600Ω, 1/4″: <300Ω
• Low Cut Filter -3dB @ 70Hz, 6dB/Octave
• Phantom Power Switch selectable, +48Volts DC, filtered, current limited
• Chassis Type All aluminum black anodized with integral rubber sides
• Power Requirements 9VAC @1000mA (external)
• Attack Time <1 ms (limit), 20ms (comp.)
• Release Time 150ms (fast), 20ms–3s Program dependant (Auto)
• Tube Type Hand selected 12AX7a
• Compressor Slope 2:1 (Comp.) / 11:1 (Limit)
• Dimensions (HxWxD) 1.75x5.9x6.5″ (44.5x150x165mm)
• Weight 2.9 lbs (1.32 kg)
• Notes
  • 0dBu = 0.775V rms
  • Weight includes power supply and packaging