Tubeopto 8™
8-CHANNEL TUBE MICROPHONE
PREAMPLIFIER / OPTICAL INTERFACE
USER’S GUIDE
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST
This symbol, wherever it appears,
alerts you to the presence of uninsulated
dangerous voltage inside the enclosure. Voltage
that may be sufficient to constitute a risk of shock.
This symbol, wherever it appears, alerts
you to important operating and maintenance
instructions in the accompanying literature.
Please read manual.
Read instructions:
Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment.
Follow the operating instructions printed in this user guide.
Do not open:
Aside from four vacuum tubes, there are no user serviceable parts inside. Refer any service work to qualified technical
personnel only.
Power sources:
Only connect the unit to mains power of the type marked on the rear panel. The power source must provide a good
ground connection.
Power cord:
Use the power cord with sealed mains plug appropriate for your local mains supply as provided with the equipment. If the
provided plug does not fit into your outlet consult your service agent. Route the power cord so that it is not likely to be
walked on, stretched or pinched by items placed upon or against.
Grounding:
Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the ground
connection on the power cord.
Ventilation:
Do not obstruct ventilation or position the unit where the air required for ventilation is impeded. If the unit is to be operated
in a rack, case or other furniture, ensure that it is constructed to allow adequate ventilation.
Moisture:
To reduce the risk of fire or electrical shock do not expose the unit to rain, moisture or use in damp or wet conditions. Do
not place a container of liquid on it, which may spill into any openings.
Heat:
Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard. Locate the unit
away from any equipment, which produces heat such as: power supplies, power amplifiers and heaters.
Environment:
Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage and
smoke, especially that associated with smoke machines.
Handling:
To prevent damage to the controls and cosmetics avoid rough handling and excessive vibration. Protect the controls from
damage during transit. Use adequate padding if you need to ship the unit. To avoid injury to yourself or damage to the
equipment take care when lifting, moving or carrying the unit.
Servicing:
Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid, objects fallen
into opening, or the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is noted.
Refer servicing to qualified technical personnel only.
Installation:
Install the unit in accordance with the instructions printed in the user guide.
II
The ART Tubeopto 8™
8-Channel Tube Microphone Preamplifier Optical Interface
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST .............................................. II
INTRODUCTION..........................................................................................................1
INSTALLATION...........................................................................................................1
AC Power Hookup.................................................................................................................................................................................. 1
Analog Audio Connections ..................................................................................................................................................................... 1
CONTROLS and JACKS ..............................................................................................2
FRONT PANEL ...................................................................................................................................................................................... 2
Instrument Input ..................................................................................................................................................................................... 2
Gain Control ........................................................................................................................................................................................... 2
Pad Switch ............................................................................................................................................................................................. 2
+48V Switches........................................................................................................................................................................................ 3
Phase Switch.......................................................................................................................................................................................... 3
Low Cut Switch....................................................................................................................................................................................... 3
LED Meter .............................................................................................................................................................................................. 3
Output Control ........................................................................................................................................................................................ 3
Sample Rate/Sync Switch ...................................................................................................................................................................... 3
Sample Rate LEDs................................................................................................................................................................................. 4
Power Switch.......................................................................................................................................................................................... 4
REAR PANEL......................................................................................................................................................................................... 4
Balanced Input Jacks – XLR & 1/4” TRS Combo Jacks ......................................................................................................................... 4
Balanced Output Jacks........................................................................................................................................................................... 4
Output Level Switch ............................................................................................................................................................................... 4
Wordclock Input and Thru Jacks ............................................................................................................................................................ 5
ADAT Jacks............................................................................................................................................................................................ 5
HARDWARE OPERATION............................................................................................6
How to adjust the preamplifier controls for the lowest noise................................................................................................................... 6
How to set the Output Level switch (on the rear panel) .......................................................................................................................... 6
Changing the sample rate ...................................................................................................................................................................... 6
Using the wordclock input....................................................................................................................................................................... 7
APPLICATIONS...........................................................................................................8
Typical applications ................................................................................................................................................................................ 8
Troubleshooting...................................................................................................................................................................................... 9
SERVICE ...................................................................................................................11
Tubeopto 8™ SPECIFICATIONS ...............................................................................12
List of Figures
FIGURE 1 - Input Channel....................................................................................................................................2
FIGURE 2 - Sample Rate Section ........................................................................................................................3
FIGURE 3 - Rear Panel ........................................................................................................................................4
FIGURE 4 - Block Diagram...................................................................................................................................5
FIGURE 5 - Wordclock Connections ....................................................................................................................7
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INTRODUCTION
The Tubeopto 8™ is the ideal Eight Channel input/output expander for any ADAT Lightpipe equipped audio
interface, direct-to-disc recorder or DAW. Eight high quality second-generation discrete class–A vacuum tube
microphone preamps are packaged in a single rack space unit with eight channel 24-bit digital I/O. The mic
preamps drive internal high quality A/D converters and a standard ADAT Lightpipe digital interface. ADAT
digital input is coupled to internal high quality D/A converters that drive eight balanced 1/4” outputs.
Every input on the Tubeopto 8™ offers full control of the signal path with pad, phase and low frequency rolloff switches. Input gain and variable output level control of each channel allows up to 70dB of clean gain with
incredible sonic transparency and the tube stage can be dialed in for warming effects and soft clipping. Each
channel has wide range LED meters that monitor the preamp output levels to the A/D while clip indicators
monitor preamplifier peak levels. Balanced 1/4" phone or XLR inputs are available on each channel and high
impedance 1/4” instrument inputs are available on channels 1 and 2.
ADAT Lightpipe I/O handles eight channels of 24-bit audio input and output at 44.1KHz, 48KHz, or externally
set sample rates. Wordclock in and thru-puts allow multiple Tubeopto 8’s to be synced in complex system
configurations.
INSTALLATION
The Tubeopto 8™ may be used in a wide variety of applications and environments. In a rack-mountable, allsteel enclosure, the unit is designed for continuous professional use. Mounting location is not critical. However,
for greater performance reliability we recommend that you not place the unit on top of power amps or other
sources of heat, or strong magnetic fields. The tube circuitry needs about a minute to “warm up” and stabilize
from a cold power up.
AC Power Hookup
The Tubeopto 8™ has an internal power supply. Only connect the unit to mains power of the type marked on
the rear panel. The power source must provide a good ground connection, and the ground pin on the mains
plug should never be defeated.
Analog Audio Connections
Audio connections to and from the Tubeopto 8™ are:
Rear balanced combo input:
[XLR]
Pin 2 = Hot (+), Pin 3 = Cold (-), Pin 1 = Ground
[1/4”]
Tip = Hot (+), Ring = Cold (-), Sleeve = Ground
Rear balanced 1/4” output:
Tip = Hot (+), Ring = Cold (-), Sleeve = Ground
Front 1/4” instrument input:
Tip = Hot (+), Ring = Cold (-), Sleeve = Ground
CONTROLS and JACKS
FRONT PANEL
Instrument Input
The 1/4” TS jack on the front panel provides a high impedance unbalanced input, and when used,
automatically switches off the mic pre-amp section. (The rear combo jack’s 1/4” TRS balanced input is lower
impedance and is part of the mic pre-amp. The rear jack is not intended to be used with high impedance
microphones or instruments.) NOTE: The PAD switch is disabled and DOES NOT affect gain when using the
Instrument input.
Gain Control
This control adjusts both the mic pre-amp gain as well as the instrument input gain. The gain markings apply
to the mic pre-amp without the Pad switch depressed. (The instrument input gain is lower than the markings.)
Please refer to the HARDWARE OPERATION section to learn how to optimize the gain control for low noise
operation.
Pad Switch
This switch reduces the mic pre-amp gain to prevent clipping when high-level microphone or line level signals
are applied to the rear panel XLR / 1/4” TRS combo jack input. This switch does NOT affect the instrument
input.
FIGURE 1 - Input Channel
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+48V Switches
These switches provide phantom power to each set of four XLR inputs. Use phantom power only when the
microphone you are using requires it. Doing so will extend the life of the Tubeopto 8™ as well as reduce the
possibility of a shock hazard.
Phase Switch
This switch selects the output phase of each channel. There is a 180-degree phase inversion through the
channel when the switch is lit.
Low Cut Switch
This switch inserts an 80Hz 6dB/Oct. Low-Cut filter into the signal path. The filter is designed to remove
rumble, pops, and wind noise, yet still sound natural.
LED Meter
The four-segment LED meter indicates the signal level at the input of the A/D converter. In addition to
monitoring the A/D level, the CLIP LED monitors all of the gain stages within the preamp channel for clipping.
Output Control
The output control provides gain or attenuation to adjust to a variety of system operating levels. This control
sets the level sent to the A/D converter.
Sample Rate/Sync Switch
This switch cycles through all of the various sample rates available to the Tubeopto 8™. Holding the switch
down will go to the next available setting.
FIGURE 2 – Sample Rate Section
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Sample Rate LEDs
This display indicates the rate and source of the A/D converter sample rate. (The D/A sample rate is
independent of this setting as it always slaves to the incoming ADAT data).
The ADAT LED will flash if there is no incoming ADAT data, or a data error. This is true for every sample rate
mode (not just ADAT).
Selecting Wordclock will light the red Wordclock LED and this LED will flash if the Tubeopto 8™ cannot use
this input as a sync source. This LED will only flash if Wordclock mode is selected.
Power Switch
This switch controls and indicates that the unit is powered up and operational. When dimly lit, it indicates a
low power source or an internal problem.
REAR PANEL
Balanced Input Jacks – XLR & 1/4” TRS Combo Jacks
These balanced inputs are used for both microphone and line level signals. The gain sensitivity is identical for
both the XLR and 1/4” TRS jacks, however the XLR input impedance is 6.4K Ohms and the 1/4” TRS input
impedance is 20K Ohms. The front panel Pad switch varies the sensitivity of both inputs.
Balanced Output Jacks
Eight low impedance 1/4” TRS balanced output jacks provide audio output from the D/A converters driven by
the ADAT Lightpipe Input.
Output Level Switch
This switch optimizes the output level of the rear output jacks with your system operating level. Depress the
switch when connected to +4dB systems. In this case the maximum output is +20dBu when the digital level
equals 0 VU.
When the switch is in the “out” position, the output levels are optimized for –10dBV systems.
FIGURE 3 - Rear Panel
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Wordclock Input and Thru Jacks
The Wordclock input is used to externally sync the Tubeopto 8™ to a master clock source. The BNC
Wordclock Input jack is connected directly to the BNC Wordclock Thru jack, providing the ability to loop
through the Tubeopto 8™ and connect other devices to the wordclock sync source, saving the use of a BNC
T–adapter.
FIGURE 4 - Block Diagram The Wordclock input is high impedance thus leaving the wordclock connection
unterminated. (A 75 Ohm BNC terminator should be used on the Wordclock Thru jack if the Wordclock Input
jack is used only.)
ADAT Lightpipe Jacks
Each ADAT Lightpipe jack supports eight channels of 24 bit digital audio data conforming to the ADAT
Lightpipe protocol, which transfers eight tracks over a single fiber optic cable. Sample rates of 44.1KHz and
48KHz are supported by this standard.
The ADAT Lightpipe Output jack data is generated by the eight internal A/D converters that are directly driven
by the outputs of the eight preamplifier channels. The A/D sample rate and sync source are selected by the
front panel switch.
The ADAT Lightpipe Input jack accepts eight channels of digital audio data at any sample rate between
40KHz and 52KHz. This data is directed thru the eight internal D/A converters to the eight rear balanced audio
outputs. The front panel Sample Rate switch DOES NOT affect this input. Since the D/A converters sample
rate is derived from whatever is coming in the ADAT Input jack, this section can lock to non-standard sample
rates as long as they are between 40KHz and 52KHz.
FIGURE 4 - Block Diagram
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HARDWARE OPERATION
How to adjust the preamplifier controls for the lowest noise
Start with the Gain and Output knobs centered, and the Pad switch in. This provides about 20dB of gain.
Increase the Gain control until the Clip LED in the meter just barely comes on during the loudest peaks in
level, and then back off the control slightly from that point. (The Clip LED should come on occasionally at
most.)
If there is not enough level with the Gain control set fully clockwise, back off the gain to 12 o’clock and place
the Pad switch in the out position. Adjust the gain control as above.
Adjust the Output control until the -10 LED is on most of the time during loud passages.
Increasing the input gain and decreasing the Output level control adds more tube warmth.
Remember, that the Clip LED looks at both the preamp input and output peaks, whereas the -10, -20, -30
LED indicators only look at the preamp output level which feeds to the A/D converter.
How to set the Output Level switch (on the rear panel)
Setting this switch correctly can lower the noise in the output signal chain by optimizing the operating levels
between the Tubeopto 8™ and external gear.
One way to determine how this switch should be set is to send audio to the Tubeopto 8™ from an ADAT
digital interface and run the audio outputs into a line input on a mixer or signal processor. Check the meters on
the mixer or signal processor to see if the level appears to be too high (clipping) or too low (barely showing any
indication on the meters). Set the Output Level switch so that the level meters in the external gear do not
indicate excessive clipping yet still provide good full-scale (or near full scale) deflection.
Changing the sample rate
The D/A converters always sync to the incoming ADAT data stream. The front panel display and switch apply
to the A/D converter sample rate and sync source. Pushing the Sample Rate switch (or holding it down) cycles
through the various settings.
The settings marked 44.1K and 48K select the internal crystal based clock generator. Selecting the internal
clock generator makes the Tubeopto 8™ the timing master for your digital system. In this case you would set
the rest of your system and software to sync to the Tubeopto 8™. When 48K mode is selected, both Green
LEDs are lit to make it easier to read.
The ADAT sync setting selects the incoming ADAT data stream as the timing source for the Tubeopto 8™. In
this case the Tubeopto 8™ would be the slave in terms of timing.
Note: If the signal at the ADAT input jack is not present or has errors, the ADAT LED will flash. This applies to
ALL sample rate selections.
The Wordclock selection synchronizes the A/D with the signal present at either of the BNC jacks. This is the
mode that should be used when you want to have an external Wordclock generator set the master system
timing, allowing for multiple devices. This LED will flash if Wordclock mode is selected AND the incoming clock
signal is not present or out of lock range.
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Using the Wordclock input
The Tubeopto 8™ can be used in both simple and complex systems. The simplest system would consist of
the Tubeopto 8™ and a single ADAT interface. As multiple digital devices are added to a system, master/slave
sample rate timing issues can degrade system audio performance. Using a single master wordclock to
synchronize all of the digital processing units reduces timing offset, and eliminates effects from any time drift
between the units thereby improving audio quality and reliability. When Wordclock is used it should to be
applied to EVERY unit in the digital audio chain including soundcards.
First, assure that the Tubeopto 8™ is connected to a good Wordclock generator running at the intended
sample rate.
Multiple Tubeopto 8™ units can be daisy-chained by looping the wordclock signal from unit to unit using the
Wordclock Input and Thru jacks of each Tubeopto 8™. A single 75 Ohm BNC terminator is placed on the
Wordclock Thru jack of the last device in the chain (furthest away from the wordclock generator).
Alternatively multiple Tubeopto 8™ units can be connected directly to the separate outputs of a wordclock
generator in which case each Tubeopto 8™ will require a 75-Ohm BNC terminator placed on its respective
Wordclock Thru jack. (Because the Tubeopto 8™ is not an internally terminated device.)
Next, click the Sample Rate button until the display shows “Wordclock”.
(If the Wordclock LED is flashing, check to make sure that the cables are connected correctly and the
incoming wordclock is between 40KHz and 52KHz.)
The Tubeopto 8™ is now slaved to the external Wordclock generator along with the other units in the
system.
FIGURE 5 - Wordclock Connections
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APPLICATIONS
Typical applications
The Tubeopto 8™ makes an ideal addition to any ADAT compatible Digidesign interface running ProTools
software. Simply connect the ADAT Output from the Tubeopto 8™ to the Optical In of the Digi product and
connect a 75 Ohm BNC cable between the Digi Wordclock Out and the Wordclock In on the Tubeopto 8™. Set
the Tubeopto 8™ for Wordclock sync and you have just added 8 more high quality preamp channels to your
ProTools setup. If you want to also use the 8 D/A outputs on the Tubeopto 8™ to expand your systems output
monitoring capability, simply connect the Optical Out from the Digi system to the ADAT Input on the Tubeopto
8™.
If you are using a Digidesign interface that does not have Wordclock output then you can use the Tubeopto
8™ in ADAT sync mode and connect both ADAT Input and Output on the Tubeopto 8™ to Optical Out and In
on the Digi unit. Set the Digi unit to be the sync clock with Optical Out and In being set to ADAT. This would be
the preferred method. Alternatively, set the Tubeopto 8™ as master and set it’s sample rate to 44.1KHz or
48KHz and connect the ADAT Output on the Tubeopto 8™ to the Optical In on the Digi unit. In this case you
will need to set the ADAT Optical In to be the “clock” within Protools.
Other ADAT Lightpipe compatible hardware and DAW applications like Cubase, Sonar, Logic, etc. can benefit
in a similar manner to the above. Just make sure you know what unit is acting as the Master Clock and set the
other units and software appropriately.
Using Wordclock as your timing master in a system allows multiple Tubeopto 8’s to be used to build as many
input channels as needed as long as you have sufficient ADAT Lightpipe Inputs. In this application you would
connect the Wordclock master to each unit and connect the multiple ADAT Lightpipe Outputs to your multiADAT input interface. Each Lightpipe cable would carry 8 channels of ADAT and they would all be synced via
Wordclock.
With the Tubeopto 8™ you can also connect it’s ADAT Output to it’s ADAT Input (using a single optical
cable), set an internal sample rate of 44.1KHz or 48KHz, and use it as a traditional 8 channel analog tube
preamp with analog outs. Adding an ADAT splitter in series with the ADAT Output and Input allows you to tap
off a digital feed while using the unit primarily as an analog preamp. In this application the signal goes through
both A/D and D/A sections so the short amount of latency through each section adds (32 samples through the
A/D and 22 samples through the D/A) up to 54 samples which is 1.125ms at 48KHz or 1.225ms at 44.1KHz.
This amount of latency is very short and should have little impact in most systems.
Digidesign and ProTools are trademarks of Avid™
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Troubleshooting
Here is a list of things to check first:
1) Check the power switch. It should be lit red (when the switch is depressed of course). If not lit red, check
the power connections and fuse on the rear panel.
2) Check the Sample Rate lights. There should always be at least one lit. On power up, they first ALL light
then light one at a time from 44K to Wordclock and finally settle to the current sample rate. If the unit does
not go through this sequence in the first 5 seconds of power up, there is a problem with the digital section.
3) If you are getting distorted audio, check to make sure that there are NO red LEDs lit on each channel’s
meter. (The clip indicators work even if the output controls are set to minimum). Reduce the Input Gain
control first to eliminate clipping.
4) If the yellow LED is flashing under any sample rate settings, the D/A outputs are muted.
5) If ADAT sync is selected, the A/D and D/A are muted if the yellow LED is flashing. Apply valid ADAT data
to the ADAT Input to correct this.
6) If the Wordclock LED is flashing, the unit cannot sync to the wordclock signal applied to the unit. Check
the connection and termination to the Wordclock jacks on the rear of the unit. Make sure that the incoming
sample rate is between 40KHz and 52KHz. Use an Internal sample rate (44.1KHz or 48KHz) or sync to
ADAT if Wordclock is not available.
7) When using the Tubeopto 8™ as a Preamp-to-ADAT only, if the red Wordclock LED is on solid or either of
the green (44.1KHz or 48KHz) LED’s are on then the Preamp, A/D, and ADAT Output sections will be
functioning normally. In this case if the yellow ADAT LED is flashing it just means that you are not using
the ADAT Input section.
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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.
10
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 power, all
cables are connected correctly, and the cables themselves are in working condition. You may want to
consult with your dealer for assistance in troubleshooting or testing your particular configuration.
2) If you believe the ART unit is at fault, go to www.artproaudio.com. You may contact Customer
Service for more assistance, or directly request a Return Authorization for service in the “resources”
area of the website.
3) If you are returning the unit for service, pack the unit in its original carton or a reasonable
substitute. The original packaging may not be suitable as a shipping carton, so consider putting the
packaged unit in another box for shipping. Print the RA number clearly on the outside of the shipping
box.
4) Include, with your unit, a note with the RA number and your contact information including a daytime
phone number, preferably attached to the top of the unit.
Fill in the following information for your reference:
Date of purchase
___________________
Purchased from
___________________
Serial number
___________________
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Tubeopto 8™ SPECIFICATIONS
Input Impedance
Mic..............................................................................................6.4K Ohm
Line ............................................................................................20K Ohm
Instrument ..................................................................................2.5M Ohm
Output Impedance
Balanced outputs........................................................................200 Ohm balanced
Frequency Response
Analog in to Digital out ...............................................................12Hz - 20KHz +0, -1dB @ 44.1 KHz sample rate
THD
1KHz ..........................................................................................< .015% @ -30dB ref clipping
20-20KHz ...................................................................................< .033%
HPF ..........................................................................................80Hz, 1-pole
Equivalent Input Noise
Mic/Line ......................................................................................-130dBu, Input shorted, Max gain, “A” wtd.
Instrument ..................................................................................-105dBu, Input shorted, Max gain, “A” wtd.
Maximum Input Level
Mic/line .......................................................................................+18dBu balanced w/Pad
Instrument ..................................................................................+15dBu
Meter clip light ............................................................................-2dB ref. A/D clip (0dB FS)
Maximum Gain
Mic..............................................................................................64dB
Instrument ..................................................................................36dB
Maximum Output level
Balanced ....................................................................................+20dBu
Unbalanced ................................................................................+14dBu
Output level switch .....................................................................Lowers Max. Output by 10dB @ -10dBV setting
Wordclock Range ..............................................................40KHz - 52KHz
Sample Rate Settings.......................................................44.1KHz, 48KHz, ADAT, Wordclock
A/D Dynamic Range ..........................................................105dB (“A” wtd.)
D/A Dynamic Range ..........................................................105dB (“A” wtd.)
A/D Latency .......................................................................... 0.667ms(48KHz), 0.725ms(44.1KHz), 32 samples
D/A Latency .......................................................................... 0.458ms(48KHz), 0.500ms(44.1KHz), 22 samples
Dimensions ..........................................................................1.75”H x 19.0”W x 14.4”D (44.5mm x 482.6mm x 365.8mm)
Weight .....................................................................................13.2 lbs. (6kg)
Power Requirements ........................................................USA – 105-125VAC, AC 60Hz, 29Watts Typical, Export units
configured for country of destination.
Minimum System Requirements .................................ADAT interface port
Note: 0 dBu = 0.775V RMS, 0dBV = 1V RMS
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 the same on products previously
manufactured. Therefore, specifications are subject to change without notice.
12
www.artproaudio.com
E-mail: cserve@artproaudio.com
© 2009 Applied Research & Technology
Tubeopto 8™
164a-5004-201
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