ART Pro Audio Tube MP/C - Manual (Page 6)

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OVERVIEW
The Tube MP/C (PreAmplifier/Compressor) is a multi-purpose tool for audio engineering and recording. Enclosed in a table-
top chassis are two independent circuits featuring a tube-based analog preamplifier and a VCA-less compressor with optical
gain reduction control. 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 Tube MP/C maintains exceptional signal integrity
and extremely low noise. A tube based opto-compressor circuit follows the tube preamp. While the preamp is always active,
the compressor may be bypassed. The preamplifier’s active balanced solid-state input provides extremely low noise and
excellent CMRR. The 1/4” input has a high impedance, which prevents the loading of any device connected to it and makes
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. Our design causes the tube to overload before the input or output stage.
This allows you to manipulate the tube gain to meet different sonic requirements. 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. The compressor is soft knee by design. Although it is capable of providing a thoroughly “squashed” signal in
"Limit" mode, it was designed to excel in areas where transparent and musical dynamics control is desired. The beauty of
the optical/tube design is its ability to apply heavy amounts of compression without pumping and breathing like VCA-based
compressors. In many cases you will hear the results of the compression without hearing the compressor.
SETTING UP
Unpacking
Your Tube MP/C was packed with care at the factory. The shipping carton was designed to protect it during initial shipment.
Please retain this carton for use in transporting the Tube MP/C, or in the unlikely event that you need to return your Tube
MP/C for servicing.
AC Power Hookup
The Tube MP/C has an external power supply designed to minimize noise and operate at 100 to 125VAC, 50 to 60Hz.
The unit requires a 9VAC power supply rated for at least 1000mA.
Audio Connections
Audio connections to and from the Tube MP/C are balanced XLR (Pin 2 Hot (+), Pin 3 Cold (-), Pin 1 Ground) and
unbalanced 1/4” (Tip Hot (+), Sleeve Ground.) We recommend using only high quality cables equipped with the appropriate
connectors.