ART Tube MP/C Microphone Preamplifier and Compressor

Warm up microphones or instruments in your studio with this tube preamp/DI box from ART, then dial in your sound with the onboard optical compressor/limiter.

The ART 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. ART's Tube MP/C circuitry is a hybrid design utilizing the most advanced, solid-state and tube technology.

The ART Tube MP/C preamplifier's active balanced solid-state input provides extremely low noise and excellent common mode rejection. The 1/4-inch high-impedance input prevents loading of any connected device making the ART 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 20 dB 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.


- 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, read more Gain Reduction and Output level
- +48V phantom power
- Phase reversal switch
- Selectable release time settings
- > 90dB dynamic range
- Custom extruded aluminum chassis
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- Input Connections: XLR balanced or 1/4" unbalanced
- Input Impedance: 1M Ohms 1/4" input, 5K Ohms XLR input
- Output Connections: 1/4" unbalanced, XLR balanced, transformer isolated.
- Output Impedance: XLR: < 600 Ohms, 1/4": < 300 Ohms
- Frequency Response: 30 Hz - 60 kHz +1 dB balanced output, 20 Hz - 60k Hz +1 dB 1/4" output
- Maximum Gain: +80 dB (balanced in-out), +64 dB (unbalanced input, balanced output)
- THD: <0.1% at 1k Hz
- CMRR: >60 dB at max gain
- Equivalent Input Noise: -128 dBu typical (A wtd., Shorted XLR balanced input, gain at max)
- Maximum Input Level: unbalanced (Inst): +15 dBu, balanced (mic): +10 dBu
- Max Output Level: +19 dBu (Line mode)
- Phantom Power: Switch selectable, +48 Volts DC, filtered, current limited
- Tube Type: Hand selected 12AX7a
- Compressor Slope: 2:1 (Comp.) / 11:1 (Limit)
- Attack Time: < 1 mSec (limit), 20 mSec (comp.)
- Release Time: 150 mSec (Fast), 20 mSec - 3 Sec Program dependent (Auto)
- Low Cut Filter: -3 dB at 70 Hz, 6 dB/Octave
- Chassis Type: All aluminum black anodized with integral rubber sides
- Power Requirements: 9 VAC at 1000 mA (external)
- Dimensions (H x W x D): 1.75" x 5.9" x 6.5", (44.5 x 150 x 165 mm)
- Weight: 2.9 lbs. (1.32 kg) with power supply and packaging
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 3 lbs
Shipping Dimensions: 11 x 7 x 3 in
Manufacturer Part Number (MPN): TUBEMP/C

For support or warranty questions, please contact the manufacturer:
Phone: 716-297-2920

Reviewers gave this product an overall rating of 4 out of 5 stars. (5 ratings)
Submitted April 19, 2023 by a customer from

"Budget Preamp That Doubles As Reamper"

Overall: 4 out of 5 stars
(see rating details)
ART created a budget do-it all preamp that does several things pretty well. We use ours as a mic preamp,instruments of all kinds-- DI w pad that also doubles as a reamper when paired with the output switch. If you need a mic splitter,try this box. Rarely use the comp/limiting ourselves.
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