Art TPS User manual

Tube Preamp
System
Two Channel Voiced Valve Preamplifier
with Output Protection Limiting (OPL)
USER’S GUIDE
A R T
APPLIED RESEARCH AND TECHNOLOGY

The ART TPS
Tube Preamp System
TABLE OF CONTENTS
Introduction ......................................................................................... 2
Installation ........................................................................................... 3
AC Power Hookup ............................................................................. 3
Analog 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
V3Variable Valve Voicing Control .................................................. 5
VU Meter ........................................................................................... 6
Output Control ................................................................................... 6
Connections ........................................................................................ 7
Dual Purpose Input Jacks (Front)....................................................... 7
XLR Input Jacks (Rear)...................................................................... 7
XLR Output Jacks (Rear) .................................................................. 8
¼"Output Jacks (Rear)...................................................................... 8
Operation ............................................................................................. 9
Warranty Information ........................................................................ 11
Service ............................................................................................... 12
TPS Specifications ......................................................................... 13

INTRODUCTION
Thank you for purchasing an ART TPS(Tube Preamp System) - and
congratulations: You now own one of the most versatile preamplifiers
available. Offering a superb level of sound quality, the TPShybrid tube
and solid state 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 New ART TPSis the
first tube microphone preamplification system designed with recording
musicians in mind. It has been carefully designed, engineered and
manufactured to provide you with years of great sound and reliable service.
The TPSextends the range of applications by adding V3 (Variable
Valve Voicing) which will help you to quickly and easily record a variety of
instruments – including drums, keyboards, acoustic and electric guitars, and
more. We also feature OPL Output Protection Limiter to make V3even
more powerful. The TPSalso functions as a direct box, with impedance
matching and preamplification for instrument or line-level sources.
FEATURES:
• Dual Analog VU metering
• V3(Variable Valve Voicing) with OPL(switch selectable)
• Over 75 dB 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
• Fully shielded all-steel chassis
• Designed and developed in the USA

INSTALLATION
The TPSmay be used in a wide variety of applications and
environments. In a rack-mountable, all-steel enclosure, the units are
designed for continuous professional use. Mounting location is not
critical. However, for greater reliability we recommend that you not
place the units 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 TPShas an internal 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.
ANALOG AUDIO CONNECTIONS
Audio connections to and from the TPS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. The front mounted jacks can act as both a balanced XLR
connection, and an unbalanced ¼"connection.
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. When
applicable, only use the power adapter that came with this unit or one
obtained from ART’s Customer Service Department.

CONTROLS & INDICATORS
INPUT CONTROL
The Input Control sets the amount of input gain of the TPS. Turn the
control clockwise to increase gain and counterclockwise to decrease
gain. You may control two ranges of gain with this control, +20 to
+68dB and +0 to +48dB. Selection of the gain range is made with the
+20dB gain switch.
NOTE: This control, along with the +20 dB Switch, is responsible for
any saturation of the tube. To change the tube character, utilize these
2 controls.
+20DB GAIN SWITCH
Use the +20dB Gain Switch to set the gain range of the input control.
When the switch is out, the unit operates in Normal mode. Depressing
the switch adds 20dB of gain. 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 TPS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. With the TPS, slowly apply and
remove the +48 volts, to prevent damage to microphones.
Be sure to turn down or mute the output of the TPS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.

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.
V3 – VARIABLE VALVE VOICING CONTROL
The TPSfeatures ART’s proprietary V3 technology. V3(which
stands for Variable Valve Voicing), provides optimized reference points
to begin the recording process for guitars, bass guitars, synths,
acoustic instruments, percussion and more.
ART engineers ran our preamplification circuit through a battery of
tests and real life studio conditions. Our goal was to create a processor
that would allow a user to have presets that were optimized for specific
recording applications. We set out to create a preamp that would be
nimble enough to handle both violins and kick drums, and nearly
everything in between.
We wanted to take the guessing out of the equation – and that is how
we developed V3. It’s simple, easy and it works really well.

For example, if you are recording an acoustic guitar, V3 has a preset
that has been optimized for that instrument. Once the preset is chosen,
the user can even fine tune the signal – which shows the true power of
V3 technology…it’s tweakable. V3 even features a multi setting, which
is useful for a wide variety of applications – like overhead micing,
broadcast and field recording.
This means that it is now quicker and easier than ever to make great
recordings! Musicians want to play, not spend hours adjusting knobs.
No other microphone preamp is as user-friendly as the TPS.
VU METER
The VU Meter gives an analog representation of the TPStube signal
level. 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 TPS. 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 preamp.

CONNECTIONS
It is easy to interface the unit with a wide variety of equipment. The front
panel houses 2 dual-purpose ¼"/ XLR input jacks, and the rear houses
balanced XLR ins and outs as well as unbalanced ¼"outs. Standard ¼"and
XLR inputs and outputs make patching simple.
DUAL PURPOSE INPUT JACKS (FRONT)
The front mounted dual purpose jacks act as both balanced XLR jacks,
and unbalanced ¼"jacks.
The XLR Input jacks are primarily intended for microphone input, and
as such can furnish Phantom Power when needed. They can handle
up to +19 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 lesser known secrets – it’s why
the unit will always sound good!).
The ¼"Input jacks are for instrument and line level inputs. They have
high input impedance to minimize any loading effects on instrument
pickups. They can also handle up to +22 dBu signals for line level
signals.
XLR INPUT JACKS (REAR)
The rear XLR jacks function the same as the front ones, as they are
directly wired together, and both cannot operate simultaneously.
If the rear XLR input and its matching front ¼"input are both in use the
TPSwill sum the two signals, with the XLR slightly attenuating the ¼"
input. This is not normally suggested.

XLR OUTPUT JACKS (REAR)
The XLR Output jacks of the TPSare active balanced. You may use
them in an unbalanced configuration without harm to the output
circuitry. The XLR outputs 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.
¼"OUTPUT JACKS (REAR)
The ¼"Output jacks are 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 TPSas a
direct box for instruments or line level signals. Make sure that both
pieces of equipment connected to the preamp’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 preamp’s
output. This interrupts the ground path and therefore breaks the loop.
Fill in the following information for your reference:
Date of purchase ___________________
Purchased from ___________________
SERIAL NUMBER ___________________

OPERATION
The TPSis one of the most versatile preamplification systems
available. Through use of the V3technology, numerous instruments
can be processed by the TPSsystem. Simply mic the instrument (if
acoustic), amp, or plug the instrument directly in to take full advantage
of V3 technology.
V3 Settings and their applications when processing:
When observing the V3dial from a clockwise perspective, the
following settings are:
Neutral Settings:
These are useful for uncolored, natural reproduction of sound.
6:00 - Neutral Flat
6:45 – Neutral Vocal (Microphone)
7:30 – Neutral Guitar Amplifier
8:15 – Neutral Bass Guitar
Warm Settings:
These are useful when warming a signal is desired.
9:00 – Warm Electronic Keyboard
9:45 – Warm Electric Guitar
10:30 – Warm Vocal Microphone
11:15 – Warm Valve
Warm Settings with OPL:
These are useful with high sound pressure levels, close proximity
micing, and spiky transients, as well as warming the signal.
12:00 – Warm OPL Multiple Applications
12:45 – Warm OPL Vocal
1:30 – Warm OPL Acoustic Guitar
2:15 – Warm OPL Piano
Neutral Settings with OPL:
These are useful with high spl’s, close micing and spiky transients, as
well as maintaining clarity.
3:00 – Neutral OPL Bass Guitar
3:45 – Neutral OPL Acoustic Guitar
4:30 – Neutral OPL Percussion
5:15 – Neutral OPL Limit

Using V3:
The V3presets have been voiced with the intent of being a starting
point for the recording process.
The key to good recordings is to consider all the variables you will
encounter during the process.
For example…which microphone are you using? Are you recording a
particularly bright guitar into a very trebly guitar amplifier? Are the
strings on your acoustic made of metal or nylon? Is the room live or
flat?
We mention this because V3is intended as a reference, not a hard-
and-fast absolute. For your particular applications, a bass guitar may
sound better through a non-bass preset.
If you need to, give it a twist…you’ll find the setting for the tone you are
searching for!
The TPSis also 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 it’s low noise and excellent tonal qualities, the TPSis
ideal for running mixes through before recording to DAT, cassette, or
even into your computer or DAW. Used as a mastering device, the
preamps are capable of adding warmth and gentle tube compression
to the signal. Variable Input and Output level controls make the
preamps ideal for level matching material in postproduction situations.

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.

SERVICE
The following information is provided in the unlikely event that your unit
requires service.
1) Be sure that the unit is the cause of the problem. Check to make sure the
unit has the proper power supplied, all cables are connected correctly, and
the cables themselves are in working condition.
2) If you find the unit to be at fault, write down a complete description of the
problem, including how and when the problem occurs. Please write down a
description of your complete setup before calling Customer Service.
3) Contact our Customer Service Department at [phone] for your
Return Authorization number or questions regarding technical assistance or
repairs. Customer Service hours are 9:00 AM to 5:30 PM Eastern Time,
Monday through Friday.
4) Pack the unit in its original carton or a reasonable substitute. The packing
box is not recommended as a shipping carton. Put the packaged unit in
another box for shipping. Print the RA number clearly on the outside of the
shipping box. Print your return shipping address on the outside of the box.
5) Include with your unit: a return shipping address (we cannot ship to a
P.O. Box), a copy of your purchase receipt, a daytime phone number, and a
description of the problem.
6) Ship your unit (keep your manual!) to:
APPLIED RESEARCH AND TECHNOLOGY
215 TREMONT STREET
ROCHESTER, NEW YORK 14608
RA# ____________________

TPS SPECIFICATIONS
Dimensions 1.75" H x 19" W x 6.5" D
Weight 5.5 lbs.
Input Connections Front: XLR (balanced)
Rear: Switchable XLR (bal.)/ ¼"TS
Output Connections XLR (balanced), ¼" TS
Input Impedance XLR, ¼"5K ohms, 1M ohm
Output Impedance XLR, ¼"300 ohms, 150ohms
Maximum Input Level, XLR +19dBu
Maximum Input Level, ¼"+22dBu
Maximum Output Level, XLR +28dBu
Maximum Output Level, ¼"+22dBu
CMRR >75dB (typical @ 1kHz)
Frequency Response 5Hz to 50kHz, +/-.1dB
Dynamic Range >100dB
Total Harmonic Distortion (THD) <0.01% (clean), <0.1%(warm)
Maximum Gain
XLR to XLR 80dB
¼"to ¼"68dB
XLR to ¼"74dB
¼"to XLR 74dB
Equivalent Input Noise (EIN)
XLR to XLR -129dBu (A weighted)
¼"to ¼" -105dBu (A weighted)
Tube Type 12AX7A, Dual Triode, Hand Selected
Power Requirements USA – 110-125V AC / 50hz/16W - Export
units configured for country of destination.
ART maintains a policy of constant product improvement. ART reserves the right to
make changes in design or make additions to or improvements upon this product
without any obligation to install same on products previously manufactured. Therefore,
specifications are subject to change without notice.
Applied Research & Technology
215 Tremont Street
Rochester, NY 14608 USA
[phone]
[phone] (FAX)
www.artproaudio.com © 2001 Applied Research & Technology