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Summary of Contents for D.W. Fearn VT-I
- Page 1 D.W. FEARN VT-I/F Vacuum Tube Instrument Interface Operating Instructions...
- Page 2 How to Contact us: Telephone: 610-793-2526 Fax: 610-793-1479 Mail: P.O. Box 57, Pocopson, PA 19366 U.S.A. Shipping Address: 182 Bragg Hill Road West Chester, PA 19382 U.S.A. e-mail: dwfearn@dwfearn.com World Wide Web: http://www.dwfearn.com...
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Page 3: Table Of Contents
Ta b l e o f C o n t e n t s History of the VT-I/F ................7 Specifications..................9 Description....................11 Installation ....................13 Operation ....................17 Theory .....................21 Maintenance....................23 List of Illustrations Rear Panel Controls and Connections ............14 Front Panel Controls and Connections ...........15... - Page 4 N o t i c e D.W. Fearn shall not be liable for technical or editorial errors or omissions in this manual, nor for incidental or consequential damages resulting from the use of this material. This instruction manual contains information protected by copyright. No part of this guide may be photocopied or reproduced in any form without prior written consent from D.W.
- Page 5 This warranty does not extend to any VT-I/F that has been damaged or rendered defective as a result of accident, misuse, or abuse; by the use of parts not manufactured or supplied by D.W. Fearn; or by unauthorized modification of the VT-I/F.
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Page 6: History Of The Vt-I/F
VT-1/VT-2 Vacuum Tube Microphone Preamplifiers. The decision was made early on that the output of the VT-I/F would be at micro- phone level. Although a line-level output is not difficult to design, it would increase the cost. - Page 7 Why does the VT-I/F sound so good? I’m not entirely sure, but I do know that it provides the proper load to the instrument. This is vital for an unrestricted sound.
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Page 8: Specifications
15 lbs (6.82 kg) NOTE: Throughout this manual, frequency is specified in cps (cycles per second) and kc (kilocycles per second). These units correspond to Hz and kHz. Specifications and price subject to change without notice. D.W. FEARN VT-I/F Vacuum Tube Instrument Interface... - Page 9 D.W. FEARN VT-I/F Vacuum Tube Instrument Interface...
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Page 10: Description
(DI). Any instru- ment designed to operate into a “guitar amp” will work perfectly with the VT-I/F. Typical instruments include: electric bass, electric guitar, electric piano, acoustic instruments with a pickup (piano, acoustic guitar, electric violin, etc.), synthesiz-... -
Page 11: Installation
3) This instruction manual Mounting The VT-I/F is designed to be placed on the floor, counter, or table-top. In most cases, cooling will not be a problem, but avoid placing the unit where it is tightly confined. Do not block the cooling holes on the top. Be sure that heavy carpeting does not interfere with air circulation through the cooling holes on the bottom. - Page 12 REAR PANEL CONNECTIONS (See Figure 1) AC (Mains) Power (2) The VT-I/F is designed to operate from 100, 120, or 220 volt, 50/60 Hz power. The unit will be shipped wired for the voltage specified in the order, but may be changed in the field if necessary.
- Page 13 VT-I/F inputs. It is important to keep the input lines as short as possible. Avoid locating the VT-I/F where it will be subjected to high sound levels or excessive vibration (such as on a drum riser).
- Page 14 1 of the output con- nector. The shield should be connected to ground at only one end; however, although not recommended, the shields can often be connected at both ends with- out a problem. D.W. FEARN VT-I/F Vacuum Tube Instrument Interface...
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Page 15: Operation
REAR PANEL CONTROLS (see Figure 1, page 14) Power switch (1) Primary power is applied to the VT-I/F circuits when the Power switch (1) is in the up position. The amber pilot lamp (5) on the front panel indicates that the unit is on. - Page 16 VT-I/F and the studio equipment, but often a loop is formed when the VT-I/F is connected to an instrument and guitar amp simultaneously. In this case, use the GND LIFT (3) switch to find the proper IMPORTANT When using the VT-I/F with the D.W.
- Page 17 1. The VT-I/F must be located near the instrument. Ten feet of cable between the instrument and the VT-I/F should be considered the maximum. 2. Use the best quality cables you can. We don’t believe you have to use eso- teric wire, but do use good quality, well-shielded cables.
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Page 19: Theory
Mic Level Output to Preamplifier To Guitar Amp Figure 3. VT-I/F Block Diagram Output Stage The output tube is the second section of the 6072/12AY7. It is operated as a cathode follower, capacitively-coupled to the custom output transformer. A resis-... - Page 20 Power Supplies Primary power from the AC mains is connected to the VT-I/F through a stan- dard IEC power input connector. The Power switch energizes all power supplies. A fuse, accessible on the rear panel, protects the VT-I/F.
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Page 21: Maintenance
Vacuum Tubes A single 12AY7 tube is used in each channel of the VT-I/F. (A 6072 may be used. This is the low-noise industrial version of the 12AY7.) There can be as much as a 15 dB difference in noise level among an assortment of tubes, and the tube used in the VT-I/F should be carefully chosen to maintain low noise. - Page 22 Handle with care. Electrolytic Capacitors The VT-I/F is designed and built to last for a long, long time, and it is possible that some components (e.g. electrolytic capacitors) may reach the end of their life long before the equipment becomes obsolete. The electrolytic capacitors used in the VT-I/F typically will last at least twenty years.
- Page 23 If you lack access to a qualified service technician with vacuum tube equipment repair experience, you may return the VT-I/F to the factory for repair. Call first, however, for shipping information.
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