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.

Key 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


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 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): +15 dBu, balancd (mic): +10 dBu

Maximum Output Level +19 dBu (Line mode)

Output Impedance XLR: <600 Ω, 1/4″: <300 Ω 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

1 in stock

SKU: 840402019466 Categories: , , , Tags: , ,