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  4. VT-4
  5. Operating Instructions Manual

D.W. Fearn VT-4 Operating Instructions Manual

Manual is about: Vacuum Tube LC Equalizer

Summary of VT-4

  • Page 1

    Operating instructions d.W. Fearn vt-4 vacuum tube lc equalizer.

  • 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 reprodu...

  • Page 4

    D.W. Fearn vt-4 vacuum tube lc equalizer 5 table of contents warranty.................................................................................7 specifications ........................................................................9 features .....................................................

  • Page 5

    Limited 5-year 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 m...

  • Page 6

    D.W. Fearn vt-4 vacuum tube lc equalizer 9 input 600 ohms input load impedance 40k ohms minimum input level -20 dbm nominal maximum input level @ 20 cps +25 db gain 0 db frequency response ± 0.5 db 20 cps to 20 kc -3 db @ 0.5 cps & 80 kc thd + noise intermodulation distortion smpte: signal to noise ...

  • Page 7

    D.W. Fearn vt-4 vacuum tube lc equalizer 11 eq features (all controls are independent and can be used in any combination) low cut at 30, 40, 100, or 400 hz, 0 to -18 db shelving in 2 db steps low boost at 20, 40, 60, or 140 hz, 0 to 12 db shelving in 2 db steps mid cut at 200, 300, 400, 500, 600, or...

  • Page 8

    D.W. Fearn vt-4 vacuum tube lc equalizer 13 history of the vt-4 throughout my career in recording, there have always been a few equalizers that stood out as being exceptional. Among my favorites are the 1970s-era neve input-strip eqs, and the trident cb9066 para- metric. I began my equalizer develop...

  • Page 9

    D.W. Fearn vt-4 vacuum tube lc equalizer 15 description the model vt-4 vacuum tube lc equalizer is designed to provide recording professionals with a son- ically superior outboard processing device. It is typically used in sound recording studios for modify- ing the frequency response characterisics...

  • Page 10

    D.W. Fearn vt-4 vacuum tube lc equalizer 17 3 . I n s ta l l a t i o n the vt-4 is carefully packed for shipment and it should survive all but the most brutal handling. If there is any damage, keep the shipping material for use during any possible claim for damage with the shipper. Included in the b...

  • Page 11

    18 d.W. Fearn vt-4 vacuum tube lc equalizer input and output connections gold-plated xlr connectors are used for inputs and outputs. The input connector is female and the output male. All connectors are wired according to aes standard: pin 1 is ground (shield), pin 2 is “high” or “+,” and pin 3 is “...

  • Page 12

    D.W. Fearn vt-4 vacuum tube lc equalizer 19 4 . O p e r a t i o n the use of most controls on the vt-4 equalizer is self-explanatory. One feature to note is that controls may be used in any combination. For example, use of both the low cut and low boost controls at the same time can result in some e...

  • Page 13

    D.W. Fearn vt-4 vacuum tube lc equalizer 21 5 . T h e o ry o f o p e r a t i o n input section line level (600 ohm source impedance, balanced, +4 dbm nominal) audio enters through the xlr-3 female input connector to the seven-position input level control. The input is balanced-bridging, with an impe...

  • Page 14

    D.W. Fearn vt-4 vacuum tube lc equalizer 23 6 . 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. Top cover removal remov...

  • Page 15

    24 d.W. Fearn vt-4 vacuum tube lc equalizer 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 ...