Art Tube MP Studio Manuel utilisateur

- 1-

The ART

TUBE MP STUDIO

TABLE OF CONTENTS

Introduction ......................................................................................... 2

Installation ........................................................................................... 3

AC Power Hookup ............................................................................. 3

Audio Connections ............................................................................ 3

Safety Precautions ............................................................................ 3

Controls and Indicators .......................................................................4

Input Control ...................................................................................... 4

+20 dB Gain Switch ........................................................................... 4

Phantom Power +48V Switch ............................................................ 4

Phase Reverse Switch ...................................................................... 5

OPL (Peak Limiter) Switch ................................................................ 5

Power/Clip/Limit LED ........................................................................ 6

VU Meter ........................................................................................... 6

Output Control ................................................................................... 6

Connections ........................................................................................ 7

¼” Input Jack...................................................................................... 7

XLR Input Jack .................................................................................. 7

XLR Output Jack ............................................................................... 7

¼” Output Jack .................................................................................. 8

Power Jack ....................................................................................... 8

Operation ............................................................................................. 9

Warranty Information ........................................................................ 10

Service ............................................................................................... 11

Tube MP Studio Specifications ........................................................ 12

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INTRODUCTION

Thank you for purchasing the Tube MP Studio - and congratulations: You

now own one of the most versatile preamplifiers available. Offering a superb

level of sound quality, the Tube MP Studio’s hybrid solid state and tube

circuit design combined with a straightforward user interface quickly and

easily gives you access to all of its features.

The original ART Tube MP put professional-caliber tube preamplification

into the hands of thousands of musicians and recordists that wanted great

tube tone in a compact and flexible package.

The Tube MP Studio extends the range of applications by adding an output

protection limiter (OPL) to precisely control output peaks, and analog VU

metering to aid in setting and maintaining proper signal levels.

The Tube MP Studio can be used in a wide variety of applications including

recording, project and home studios, where its metering functionality and

OPL circuitry really shines. It also functions as a direct box, with impedance

matching and preamplification for instrument or line-level sources.

FEATURES:

• Built-in analog VU metering

• Built-in OPL (switch selectable)

• Over 60dB of gain

• Hand selected 12AX7A dual triode tube

• Balanced XLR inputs and outputs

• ¼” High impedance Instrument input and ¼” line level output

• +48V Phantom power (switch selectable)

• Phase Reverse Switch

• Gain (+20dB) Switch

• Input Gain Control

• Output Level Control

• Multifunction, dual color LED Power/Clip/Limit indicator

• Fully shielded all steel chassis

• Designed and developed in the USA

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INSTALLATION

The Tube MP Studio may be used in a wide variety of applications and

environments. Self-contained in an all-steel enclosure, the Tube MP

Studio is designed for continuous professional use. Because the unit is

compact and lightweight, mounting location is not critical. However, for

greater reliability we recommend that you not place the Tube MP

Studio on top of power amps or other sources of heat. The tube

circuitry needs about a minute to “warm up” from a cold power up.

AC POWER HOOKUP

The Tube MP Studio has an external power supply designed to

operate at 115 VAC @ 50 to 60 Hz. Units manufactured for use

outside the United States of America have been modified to comply

with the required electrical specifications. Only use the adapter that

came with the Tube MP Studio. If the adapter becomes lost or

damaged, contact ART Customer Service for replacement. If you need

to purchase one locally, just make sure that you specify 9 Volt AC (not

DC), at 800 ma.

AUDIO CONNECTIONS

Audio connections to and from the Tube MP Studio are balanced XLR

(Pin 2 = Hot (+), Pin 3 = Cold (-), Pin 1 = Ground) and unbalanced ¼”

(Tip = Hot (+), Sleeve = Ground). We recommend that you switch off

the +48V Phantom Power whenever changing connections to the XLR

input.

SAFETY PRECAUTIONS

Warning: To avoid the risk of shock or fire, do not expose this unit to

moisture. Refer all servicing to qualified personnel. Do not remove the

metal cover; there are no user-serviceable parts inside. Only use the

power adapter that came with this unit or one obtained from ART’s

Customer Service Department.

- 4-

CONTROLS & INDICATORS

INPUT CONTROL

The Input Control sets the amount of input gain of the Tube MP Studio.

Turn the control clockwise to increase gain and counterclockwise to

decrease gain. You may control two ranges of gain with this control,

+26 to +60dB and +6 to +40dB. Selection of the gain range is made

with the +20dB gain switch.

+20DB GAIN SWITCH

Use the +20dB Gain Switch to set the gain range of the input control.

When the switch is out, the Tube MP Studio operates in Normal mode.

Depressing the switch adds 20dB of gain. This mode is indicated by

the labeling in red and corresponds directly to the input control’s red

gain range labeling. For microphone applications, where more gain is

needed, push the switch in. For hot line level inputs, set the switch in

the out position.

PHANTOM POWER +48V SWITCH

The Tube MP Studio can power any microphone needing +48 volts DC

Phantom power. Phantom power is supplied to pins 2 and 3 of the XLR

Input jack when this switch is depressed. The Tube MP Studio slowly

applies and removes the +48volts, to prevent damage to microphones.

Be sure to turn down or mute the output of the Tube MP Studio when

engaging or disengaging Phantom power. Additionally, when

disengaging, allow 30 to 45 seconds for the power to completely

discharge. Most microphones will make a sound like air leaking from a

tire when Phantom power is disconnected, but some can make some

very nasty low rumbles and whines as well.

- 5-

Dynamic microphones should not be affected or damaged if they are

plugged into a line where Phantom power is present. However, if the

mic doesn't need it, do not use it. Some things are best left untested!

PHASE REVERSE SWITCH

The Phase Reverse switch is provided to reverse the phase of the

signal. This switch works on Pins 2 and 3 of the XLR output jack and

also reverses the polarity of the ¼” output jack. In the Normal position,

the signal is in-phase. In the Reverse (or “in”) position, Pins 2 and 3

are reversed and the signal is changed to 180 degrees out of phase.

In multiple microphone applications, mic placement can affect the

phase of the signals. If two microphones pick up the same signal from

different locations, the result can be a hollow or frequency “shifted”

sound. In some cases it may sound as if an instrument disappears if it

happens to be 180 degrees out of phase. Depressing the Phase switch

can remedy this. In general, if your sound is “thin” or “out of position”,

try reversing the phase to correct the problem.

OPL (PEAK LIMITER) SWITCH

Depressing this switch engages the OPL (Output Protection Limiter)

circuitry. This circuit precisely and accurately controls the output peak

signal level. This FET (field effect transistor) peak limiter has a fast

attack for peaks and slow release time. This helps you to prevent

clipping or overload of equipment that follows the Tube MP Studio,

such as the A/D converters on a sound card or digital recorder, in-ear

monitor systems, or live monitoring system. When engaged, the output

signal is limited to approximately 0dBu at the ¼” output jack and +6dBu

at the XLR output jack, with the Output control all the way up. The VU

Meter and LED indicator reflect the OPL circuit’s action.

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POWER/CLIP/LIMIT LED

The bi-color Power/Clip/Limit LED lights green after power is applied

and with lower level signals. If OPL is not being used, then the LED will

serve as a signal clip indicator. It will light red whenever the signal at

the tube’s output is about to clip. If the LED is constantly lit, reduce the

signal level with the Input gain control, or Activate the OPL circuitry.

When the OPL circuit is engaged, the LED will turn red whenever the

output signal peaks exceed the limiter's threshold, at which point the

limiter will reduce gain automatically, to prevent output clipping.

VU METER

The VU Meter gives an analog representation of the Tube MP Studio’s

output signal level. “0dB” on the meter represents +6dBu at the ¼”

output jack and +12dBu at the XLR output jack. Besides showing the

average analog level, it is sensitive to attack transients. When not

using OPL, the VU Meter is a great indicator of how hard you are

running the tube. It also helps in setting a consistent level as you

change mics and instrument sources.

The VU Meter also reflects the impact of the OPL circuitry on the

signal. For example, if the signal is “in the red” on the meter, the meter

will reflect the attenuation of the signal when the OPL is activated, and

the signal is brought out of the “red” .

OUTPUT CONTROL

The Output Control sets the output level of the Tube MP Studio. When

the control is fully counterclockwise, there is no output. Turning the

control clockwise increases the level of the output signal. When setting

the Output level control, refer to the VU Meter for an accurate level

leaving the Tube MP Studio.

- 7-

CONNECTIONS

Despite the Tube MP Studio’s sophistication, it is easy to interface the unit

with a wide variety of equipment. All inputs and outputs, are located on the

rear panel. Standard ¼” and XLR inputs and outputs make patching simple.

¼” INPUT JACK

The ¼” Input jack is for instrument and line level inputs. It has a high

input impedance to minimize any loading effects on instrument

pickups. It can also handle up to +22 dBu signals for line level signals.

Though not normally suggested, both input jacks can be used

simultaneously, in a pinch, to sum two signals. The signal present at

the XLR jack will tend to attenuate the signal of the ¼” input.

XLR INPUT JACK

The XLR Input jack is primarily intended for microphone input, and as

such can furnish Phantom Power when needed. It can handle up to

+14 dBu signals, which is the hottest signal you would get out of any

microphone. For even hotter input signals, you should use the ¼” input

jack. The XLR Input jacks medium input impedance is extremely flat

over a wide frequency range, which allows it to be musically neutral to

virtually any microphone (one of the Tube MP's lesser known secrets).

XLR OUTPUT JACK

The XLR Output jack of the Tube MP Studio is active balanced. You

may use it in an unbalanced configuration without harm to the output

circuitry. The XLR output can provide a hefty signal level (+28dBu) at a

low impedance, so make sure that you do not overdrive equipment

with sensitive inputs. When using it on the front end of a mixer, go into

the mixer’s line in or insert inputs and not necessarily into the mixer’s

microphone input, unless the mixer can pad that input’s level.

- 8-

¼” OUTPUT JACK

The ¼” Output jack is unbalanced and should be used for sending

signals to amps, processors, or other unbalanced configurations.

Both balanced and unbalanced output connections may be used

simultaneously. This is particularly useful when using the Tube MP

Studio as a direct box for instruments or line level signals. Make sure

that both pieces of equipment connected to the Tube MP Studio’s

outputs are connected to the same earth ground, beforehand, to avoid

electrical shock.

If you experience a grounding hum when using both output connectors

(one to a console, one to an instrument amp) simultaneously, a ground

loop may be the problem. To remedy this problem, disconnect the

ground wire (pin 1) from the XLR cable plugged into the Tube MP

Studio’s output. This interrupts the ground path and therefore breaks

the loop.

POWER JACK

An external 9 Volt AC adapter powers the Tube MP Studio. Plug the

adapter into the PWR jack and then into a power outlet. Only use the

adapter that came with the Tube MP Studio. If the adapter ever

becomes damaged, immediately discontinue use. They can be

purchased locally or directly from ART. Just make sure that you specify

9 Volt AC (not DC), at 800 ma.

Fill in the following information for your reference:

Date of purchase ___________________

Purchased from ___________________

SERIAL NUMBER ___________________

- 9-

OPERATION

The main application of the Tube MP Studio is a microphone

preamplifier. Plug any microphone directly into either input and set the

input and output controls to provide an appropriate level into the next

stage of your system.

Use the Tube MP Studio as an acoustic or piezo pickup preamplifier to

run directly into a console, amp, processor, recorder, or sound card.

The Tube MP Studio is ideal for use as a DI box. Plug the instrument

into either input and use the XLR or ¼” (or both) outputs to connect to

your recorder, board or PA system.

Because of its low noise and excellent tonal qualities, the Tube MP

Studio is ideal for running mixes through before recording to DAT or

cassette. Used as a mastering device, the Tube MP Studio is capable

of adding warmth and gentle tube compression to the signal. Variable

Input and Output level controls make the Tube MP Studio ideal for

level matching material in postproduction situations.

- 10 -

WARRANTY INFORMATION

Limited Warranty

Applied Research and Technology will provide warranty and service for this

unit in accordance with the following warrants:

Applied Research and Technology, (A R T) warrants to the original

purchaser that this product and the components thereof will be free from

defects in workmanship and materials for a period of three years from the

date of purchase. Applied Research and Technology will, without charge,

repair or replace, at its option, defective product or component parts upon

prepaid delivery to the factory service department or authorized service

center, accompanied by proof of purchase date in the form of a valid sales

receipt.

Exclusions:

This warranty does not apply in the event of misuse or abuse of the product

or as a result of unauthorized alterations or repairs. This warranty is void if

the serial number is altered, defaced, or removed.

A R T reserves the right to make changes in design or make additions to or

improvements upon this product without any obligation to install the same

on products previously manufactured.

A R T shall not be liable for any consequential damages, including without

limitation damages resulting from loss of use. Some states do not allow

limitations of incidental or consequential damages, so the above limitation or

exclusion may not apply to you. This warranty gives you specific rights and

you may have other rights, which vary, from state to state.

For units purchased outside the United States, an authorized distributor of

Applied Research and Technology will provide service.

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