DigiTech VTP1 User Manual

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DigiTech VTP1 User Manual

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.

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 INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 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.

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 LAMP with manufacturers recommended part ( Refer to service literature)

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: THIS APPLIANCE MUST BE EARTHED.

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

 

 

 

 

Supplementary Information:

Manufacturer’s Name:

IVL Technologies Ltd.

 

The product herewith complies with the requirements of the Low Voltage Directive

 

 

per DigiTech specifications

 

73/23/EEC and the EMC Directive 89/336/EEC (1989) as ammended by the CE

Manufacturer’s Address:

#108-721 Vanalman Ave

 

Marking Directive 93/68/EEC (1993).

 

 

Victoria, B.C.

 

 

 

 

Canada V8Z 3B6

 

IVL Technologies Ltd.

declares that the products:

 

 

#108-721 Vanalman Ave.

 

 

DigiTech VTP-1 Dual Vacuum Tube Preamp

Victoria, B.C.

 

 

 

 

Canada V8Z 3B6

conform to the following product specifications:

 

March 4, 1996Peter George

 

 

 

 

Vice President of Engineering

Safety:

EN 60065

EMC:

EN 55022 (1987):

 

 

IEC 65 (1993)

CISPR 22 (1993) Class B

European Contact: Your local DigiTech Sales and Service Office or

 

Amendment 1 (1987)

EN 50082-1 (1992)

International Sales Office

 

Amendment 2 (1989)

 

3 Overlook Drive Unit #4

 

Amendment 3 (1992)

 

Amherst, New Hampshire 03031, USA Tel (603) 672-4244 Fax (603) 672 4246

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 A vacuum 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. A parallel-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 A vacuum 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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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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