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ART Tube MP/C Project Series - Tube Pre-Amplifier / Opto-Compressor / Limiter


The Tube MP/C (PreAmplifier/Compressor) 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.


Optional ART SM1 stand mount securely attaches the Tube MP/C to any microphone stand for live stage or studio applications is available.

Tube-based mic/line preamplifier with up to 80 dB of gain

Hand-selected 12AX7a tube

Optical (VCA-less) compressor circuitry = transparent dynamics control

¼-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


Frequency Response 30 Hz - 60 kHz +/- 1 dB balanced output, 20 Hz - 60 kHz +/- 1dB 1/4" output

Total Harmonic Distortion <0.1% @ max gain

CMMR > 60 dB @ max gain

Equivalent Input Noise -128dBu typical ("A" wtd., Shorted XLR balanced input, gain @ max)

Input Impedance 1M Ohms 1/4" input, 5K Ohms 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): +15 dBu, balancd (mic): +10 dBu

Maximum Output Level +19 dBu (Line mode)

Output Impedance XLR: <600 Ohms, 1/4": <300 Ohms

Low Cut Filter -3 dB @ 70 Hz, 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), 20 ms (comp.)

Release Time 150ms (fast), 20ms - 3s Program dependant (Auto)

Tube Type Hand selected 12AX7a

Compressor Slope 2:1 (Comp.) / 11:1 (Limit)

Dimensions 1.75"H x 5.9" W x 6.5" D (44.5mm x 150mm x 165mm)

Weight 2.9 lbs (1.32 kg)

Notes 0dBu = 0.775V rms 

Weight includes power supply and packaging

Equipment available to buy from this site is for professional use only. Please note in certain countries some products listed may not be available from A.C. Entertainment Technologies Ltd.

E&OE. Information is subject to change without notice. The rights and ownership of all trademarks are recognised.


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