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Table of Contents
Summary of Contents for D.W. Fearn VT-4
- Page 1 D.W. FEARN VT-4 Vacuum Tube LC Equalizer 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 Web: www.dwfearn.com...
- Page 3 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 manual may be photocopied or reproduced in any form without prior written consent from D.W.
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Page 4: Table Of Contents
TABLE OF CONTENTS Warranty.................7 Specifications ................9 Features ................11 History of the VT-4 ..............13 Description ................15 Installation ................17 Operation ................19 Theory .................21 Maintenance ................23 D.W. Fearn VT-4 Vacuum Tube LC Equalizer... -
Page 5: Warranty
During the warranty period, D.W. Fearn will, at no additional charge, repair or replace defective parts with new parts. This warranty does not extend to any VT-4 that has been damaged or rendered defec- tive as a result of accident, misuse, or abuse; by the use of parts not manufactured or supplied by D.W. -
Page 6: Specifications
Note: Throughout this manual, frequency is specified in cps (cycles per second) or kc (kilocycles per second). These units of measurement correspond to Hz and kHz respec- tively. Specifications subject to change without notice D.W. Fearn VT-4 Vacuum Tube LC Equalizer... -
Page 7: Features
Note: Throughout this manual, frequency is specified in cps (cycles per second) or kc (kilocycles per second). These units of measurement correspond to Hz and kHz respec- tively. Specifications subject to change without notice D.W. Fearn VT-4 Vacuum Tube LC Equalizer... -
Page 8: History Of The Vt-4
I almost always prefered the shelving curve. So the VT-4 was designed around those preferences -- low-Q curves, shelving, with simultaneous boost and cut, mid-range cut but not boost, and using passive LC circuitry. -
Page 9: Description
The philosophy behind the VT-4 is: use only the best components in an optimized circuit, and build it with pride and precision. The VT-4 is designed and built to perform in your studio for decades to come. D.W. Fearn VT-4 Vacuum Tube LC Equalizer... -
Page 10: Installation
Be sure the bottom vent slots are not blocked. It is essen- tial that air can flow into the bottom and out of the top of the VT-4. Equipment that runs cool can last for a very long time. - Page 11 If the device being fed by the VT-4 has an input termination switch, that switch should be in the “off” position. The VT-4 can feed balanced or unbalanced inputs with no need for any modification in output wiring.
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Page 12: Operation
4. Reducing the Input control setting may be helpful in this circumstance. It also allows the overall output level of the VT-4 to be reduced to provide a better level to the recorder. Settings above the “0” position are useful when processing signals from semi- pro gear that typically have a lower output level. -
Page 13: Theory
Jensen Transformers Inc. The input switch is a passive pad on the primary of input transformer. A two-stage Class-A triode amplifer utilizing 6N1P vacuum tubes pro- vides isolation from the input of the VT-4 to the passive LC equalization circuitry. Equalization section All equalization is accomplished with passive LC (inductor/capacitor) circuitry. -
Page 14: Maintenance
M A I N T E N A N C E The VT-4 is built with only the highest quality parts and will prove to be extremely reli- able. Vacuum tubes and electrolytic capacitors, however, have a finite useful life and must be replaced eventually. - Page 15 Rotary Switches The rotary switches in the VT-4 were chosen for their self-cleaning property. In a clean environment (non-smoking, with frequent room and equipment vacuum cleaning), and with regular use, the rotary switches should require little attention for years. But if clean- ing becomes necessary, we recommend using De-Oxit (Caig Laboratories).