DigiTech VTP1 User Manual
WARNING
FOR YOUR PROTECTION, PLEASE READ THE
FOLLOWING:
Water and Moisture: Appliance should not be used near water (e.g. near a
bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a
swimming pool, etc). Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
POWER SOURCES: The appliance should be connected to a power supply
only of the type described in the operating instructions or as marked on the
appliance.
GROUNDING OR POLARIZATION: Precautions should be taken so that the
grounding or polarization means of an appliance is not defeated.
POWER CORD PROTECTION: Power supply cords should be routed so that
they are not likely to be walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs, convenience receptacles,
and the point where they exit from the appliance.
SERVICING: To reduce the risk of fire or electric shock, the user should not
attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.
CAUTION: To reduce the risk of fire replace only with same type fuse.
ATTENTION: Utiliser un fusible de recharge de même type.
CAUTION: To reduce the risk of fire replace LAMPwith manufacturers recommended part ( Refer to service literature)
U.K. MAINS PLUG WARNING
A moulded mains plug that has been cut off from the cord is unsafe. Discard
the mains plug at a suitable disposal facility. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERTA DAMAGED OR CUT MAINS
PLUG INTO A13 AMP POWER SOCKET. Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtained from
your local retailer. Replacement fuses are 13 amps and MUST be ASTA
approved to BS1362.
The symbols shown above are internationally accepted symbols that warn of
potential hazards with electrical products. The lightning flash with arrowpoint
in an equilateral triangle means that there are dangerous voltages present within the unit. The exclamation point in an equilateral triangle indicates that it is
necessary for the user to refer to the owner’s manual.
These symbols warn that there are no user serviceable parts inside the unit.
Do not open the unit. Do not attempt to service the unit yourself. Refer all
servicing to qualified personnel. Opening the chassis for any reason will void
the manufacturer’s warranty. Do not get the unit wet. If liquid is spilled on
the unit, shut it off immediately and take it to a dealer for service. Disconnect
the unit during storms to prevent damage.
ELECTROMAGNETIC
COMPATIBILITY
This unit conforms to the Product Specifications noted on the Declaration of
Conformity. Operation is subject to the following two conditions:
• this device may not cause harmful interference, and
• this device must accept any interference received, including
interference that may cause undesired operation. Operation of
this unit within significant electromagnetic fields should be
avoided.
• use only shielded interconnecting cables.
FCC COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in acordance with the instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and receiver that may cause
undesired operation.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected
• Consult the dealer or an experienced radio/TV technician for help.
SAFETY INSTRUCTIONS
Notice For Customers If Your Unit Is Equipped With A Power Cord.
WARNING:THISAPPLIANCEMUSTBEEARTHED.
The cores in the mains lead are coloured in accordance with the following
code:
GREEN and YELLOW - Earth BLUE - Neutral BROWN - Live
As colours of the cores in the mains lead of this appliance may not correspond
with the coloured markings identifying the terminals in your plug, proceed as
follows:
• The core which is coloured green and yellow must be connected to the terminal in the plug marked with the letter E, or
with the earth symbol, or coloured green, or green and yellow.
• The core which is coloured blue must be connected to the terminal marked N or coloured black.
• The core which is coloured brown must be connected to the
terminal marked L or coloured red.
This equipment may require the use of a different line cord, attachment plug,
or both, depending on the available power source at installation. Connect this
equipment only to the power source indicated on the equipment rear panel. If
the attachment plug needs to be changed, refer servicing to qualified service
personnel who should refer to the table below. The green/yellow wire shall be
connected directly to the unit's chassis.
WARNING: If the ground is defeated, certain fault conditions in the unit or in
the system to which it is connected can result in full line voltage between
chassis and earth ground. Severe injury or death can then result if the chassis
and earth ground are touched simultaneously.
DECLARATION OF CONFORMITY
Manufacturer’s Name: IVL Technologies Ltd.
per DigiTech specifications
Manufacturer’s Address: #108-721 Vanalman Ave
Victoria, B.C.
Canada V8Z 3B6
declares that the products:
DigiTech VTP-1 Dual Vacuum Tube Preamp
conform to the following product specifications:
EMC: EN 55022 (1987):
CISPR 22 (1993) Class B
EN 50082-1 (1992)
Supplementary Information:
The product herewith complies with the requirements of the Low Voltage Directive
73/23/EEC and the EMC Directive 89/336/EEC (1989) as ammended by the CE
Marking Directive 93/68/EEC (1993).
IVL Technologies Ltd.
#108-721 Vanalman Ave.
Victoria, B.C.
Canada V8Z 3B6
March 4, 1996Peter George
Vice President of Engineering
European Contact: Your local DigiTech Sales and Service Office or
International Sales Office
3 Overlook Drive Unit #4
Amherst, New Hampshire 03031, USA Tel (603) 672-4244 Fax (603) 672 4246
Safety: EN 60065
IEC 65 (1993)
Amendment 1 (1987)
Amendment 2 (1989)
Amendment 3 (1992)
Digitech VTP-1 Owner’s Manual
Table of Contents
Introduction
.................................................................................1
Warranty......................................................................................2
Connection Examples...........................................................3
Rear Panel.................................................................................4
Wiring Scheme..........................................................................4
Mic Input...................................................................................4
Line Inputs.................................................................................4
Insert Loop ................................................................................5
Send...........................................................................................5
Return ........................................................................................5
Digital Outputs ..........................................................................5
Front Panel.................................................................................6
Post Trim...................................................................................6
Pre Gain.....................................................................................6
The VU Meter and CLIP LED..................................................7
The EQ section..........................................................................7
EQ In/Out switch.......................................................................8
Lo Cut switch ............................................................................8
Mic/Line Input switch...............................................................8
Phase Reverse switch ................................................................9
20 dB Pad ..................................................................................9
+48V phantom power switch ....................................................9
DIGITAL OUTPUT Section .....................................................9
FORMAT Switch ................................................................9
SAMPLE RATE Switch .....................................................9
Appendix
Signal Flow Diagram .................................................................i
Specifications ............................................................................ii
Introduction
Thank you for purchasing the Digitech VTP-1 vacuum tube preamplifier. This product was developed to help you improve the sound of your digital recording, analog recording, and live performance.
The VTP-1 offers a better alternative to using the average quality microphone preamps found in the
typical multi-input console. For economic reasons, these console preamps are typically of lower
quality than a single, dedicated unit. You can use the VTP-1 to get your basic tracks sounding great
and then you can run the finished mix through it for final “tube” treatment and equalization.
The VTP-1’s preamplifier circuit is a hybrid design consisting of a high-voltage class Avacuum tube
amplification stage, coupled with an ultralow noise, low distortion solid-state driver stage. In the
VTP-1’s base configuration, the solid-state driver stage provides 40 dB of gain to the microphone
inputs. With the optional input transformers installed, the driver stage gain is reduced to 20 dB,
with 20 dB of virtually “noiseless” self-gain provided by the transformers.
Please contact DOD Electronics at 801-566-8800 to order the transformer installation
instructions and parts kit.
The vacuum tube amplification stage is a classic, high plate-voltage design utilizing a pure class A
topology. Aparallel-triode arrangement is employed, in addition to a fully-regulated 235V plate
supply to maximize signal-to-noise performance and transient response. Only premium-grade
12AX7A vacuum tubes are used in the VTP-1 which are hand-tested and graded specifically for the
VTP-1 by Audio Glassic in the USA.
Precision 1% metal-film resistors are used throughout the audio path to ensure performance stability
and low noise. In addition to precision resistors, all filter and equalization circuits utilize high quality plastic-film capacitors to maintain spectral accuracy and minimize the long-term effects of component drift. To ensure years of trouble-free operation, each VTP-1 must pass a rigorous set of performance tests and a 24-hour burn-in period before it is shipped from the factory
Features
• Low noise, pure Class Avacuum tube preamplifier stage
• Line level input that accepts -10 dBv and +4 dBu signals
• Single vacuum tube per channel with adjustable gain and trim controls
• Four band semi-parametric equalization with EQ bypass switch
• 75 Hz low cut filter with steep 12 dB/octave
• 18 bit digital output to AES/EBU and S/PDIF digital protocols
• XLR and TRS 1/4” balanced analog inputs and outputs
• Post EQ insert loop
• Combined VU metering and multisource peak indication
• Switches for 48 volt phantom power, phase reversal, 20 dB gain pad and input select
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1 •••
Warranty
1. The warranty registration card must be mailed within ten days after purchase date to validate the
warranty.
2. DigiTech warrants this product, when used solely within the U.S., to be free from defects in
materials and workmanship under normal use and service.
3. DigiTech liability under this warranty is limited to repairing or replacing defective materials that
show evidence of defect, provided the product is returned to DigiTech WITH RETURN
AUTHORIZATION, where all parts and labor will be covered up to a period of one year. A
Return Authorization number may be obtained from DigiTech by telephone. The company shall
not be liable for any consequential damage as a result of the product’s use in any circuit or
assembly.
4. Proof-of-purchase is considered to be the burden of the consumer.
5. DigiTech reserves the right to make changes in design, and make additions or improvements to
this product without incurring any obligation to install the same on products previously manufactured.
6. The foregoing is in lieu of all other warranties, expressed or implied, and DigiTech neither
assumes nor authorizes any person to assume any obligation or liability in connection with the
sale of this product. In no event shall DigiTech or its dealers be liable for special or consequential
damages, or from any delay in the performance of this warranty due to causes beyond their control.
DigiTech™ and VTP-1 are registered trademarks of DOD Electronics Corporation.
IMPORTANT:
The information contained in this manual is subject to change at any time without notification.
Some information in this manual may also be inaccurate due to undocumented changes in the product or operating system since this version of the manual was completed. The information contained
in this version of the manual supersedes all previous versions.
•••
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