ART Tube MP/C Microphone Preamp

The ART Tube MP/C Project Series is a versatile audio tool designed for both audio engineering and recording applications. It combines a tube-based analog preamplifier with a VCA-less compressor in a compact, desktop-friendly chassis. This dual-circuit configuration allows the ...The ART Tube MP/C Project Series is a versatile audio tool designed for both audio engineering and recording applications.

It combines a tube-based analog preamplifier with a VCA-less compressor in a compact, desktop-friendly chassis. This dual-circuit configuration allows the Tube MP/C to function effectively as a microphone/line preamp or a direct input (DI) box, making it suitable for various setups, including recording studios, live sound reinforcement, and electronic instrument integration. The preamplifier section of the Tube MP/C features an active balanced solid-state input, which ensures extremely low noise levels and excellent common mode rejection.

This is particularly beneficial for maintaining signal integrity and minimizing unwanted noise in professional audio environments. The high impedance ¼-inch input prevents loading on connected devices, making it ideal for direct input or line-level applications. The preamp's second stage utilizes a hand-selected 12AX7a tube, operating on a regulated DC voltage to provide an additional 20d - B of gain, enhancing the overall audio quality and warmth.

The compressor circuit of the Tube MP/C employs a VCA-less design, utilizing optical electronics (Vactrol) coupled with a 12AX7a vacuum tube gain stage. This configuration offers transparent dynamics control, preserving the musicality of the audio signal while providing effective compression. The compressor's design ensures that the dynamics are managed smoothly, without introducing unwanted artifacts.

For connectivity, the Tube MP/C includes both ¼-inch unbalanced and XLR balanced inputs and outputs, with a transformer-isolated XLR output for enhanced signal integrity. The device also offers selectable output ranges to accommodate both line and instrument interface levels. LED meters provide visual feedback for tube warmth, gain reduction, and output level, allowing users to monitor performance easily.

Additional features include +48V phantom power for condenser microphones, a phase reversal switch for addressing phase issues, and selectable release time settings for tailored compression response. The device boasts a dynamic range greater than 90d - B, ensuring it can handle a wide range of audio signals without distortion. The custom extruded aluminum chassis provides durability and protection for the internal components.

Technical specifications highlight the Tube MP/C's performance capabilities, with a frequency response of 30 Hz to 60 k - Hz for balanced output and 20 Hz to 60 k - Hz for ¼-inch output. Total harmonic distortion is kept below 0.1% at maximum gain, ensuring clean audio reproduction. The equivalent input noise is rated at -128d - Bu, providing a quiet operation.

The device supports a maximum gain of +80 d - B for balanced in-out connections and +64 d - B for unbalanced input to balanced output. The maximum output level reaches +19 d - Bu in line mode, and the unit features a low cut filter at -3 d - B @ 70 Hz with a 6d - B/octave slope. The ART Tube MP/C is powered by an external 9VAC adapter and features a robust aluminum chassis with integral rubber sides for stability.

Its compact dimensions and lightweight design make it a practical choice for both studio and live applications. An optional ART SM1 stand mount is available for securely attaching the unit to any microphone stand, enhancing its versatility in various settings. - ART Tube MP/C Project Series Tube Preamp/opto-compressor/limiter