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
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Tube-based mic/line preamplifier with up to 80 dB of gain
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Hand-selected 12AX7a tube
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Optical (VCA-less) compressor circuitry = transparent dynamics control
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1/4-inch unbalanced inputs and outputs
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XLR balanced inputs and outputs
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Transformer isolated XLR output
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Selectable output range for Line/Instrument interface levels
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LED meters for Tube Warmth, Gain Reduction and Output level
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+48V phantom power
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Phase reversal switch
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Selectable release time settings
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> 90dB dynamic range
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Custom extruded aluminum chassis
Specifications
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Frequency Response |
30 Hz – 60 kHz +/- 1 dB balanced output, 20 Hz – 60 kHz +/- 1dB 1/4″ output |
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Total Harmonic Distortion |
<0.1% @ max gain |
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CMMR |
> 60 dB @ max gain |
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Equivalent Input Noise |
-128dBu typical (“A” wtd., Shorted XLR balanced input, gain @ max) |
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Input Impedance |
1M Ω 1/4″ input, 5K Ω XLR input |
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Input/Output Connections |
Input: XLR balanced or 1/4″ balanced. Output: 1/4″ unbalanced XLR balanced, transformer isolated. |
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Maximum Gain |
+80 dB (balanced in-out, +64dB (unbalanced input, balanced output) |
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Maximum Input Level |
unbalanced (Inst): +15 dBu, balancd (mic): +10 dBu |
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Maximum Output Level |
+19 dBu (Line mode) |
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Output Impedance |
XLR: <600 Ω, 1/4″: <300 Ω |
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Low Cut Filter |
-3 dB @ 70 Hz, 6dB/Octave |
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Phantom Power |
Switch selectable, +48Volts DC, filtered, current limited |
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Chassis Type |
All aluminum black anodized with integral rubber sides |
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Power Requirements |
9VAC @ 1000mA (external) |
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Attack Time |
<1 ms (limit), 20 ms (comp.) |
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Release Time |
150ms (fast), 20ms – 3s Program dependant (Auto) |
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Tube Type |
Hand selected 12AX7a |
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Compressor Slope |
2:1 (Comp.) / 11:1 (Limit) |
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Dimensions |
1.75″H x 5.9″ W x 6.5″ D (44.5mm x 150mm x 165mm) |
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Weight |
2.9 lbs (1.32 kg) |
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Notes |
0dBu = 0.775V rms
Weight includes power supply and packaging |