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Operating Instructions

D.W. FEARN

VT-4 Vacuum Tube LC Equalizer

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Summary of Contents for VT4

Page 1: ...Operating Instructions D W FEARN VT 4 Vacuum Tube LC Equalizer...

Page 2: ...o 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...

Page 3: ...or incidental or consequential damages resulting from the use of this material This instruction manual contains information protected by copyright No part of this manu al may be photocopied or reprodu...

Page 4: ...sult of accident misuse or abuse by the use of parts not manu factured or supplied by D W Fearn or by unauthorized modification of the VT 4 Vacuum tubes are excepted from the 5 year warranty but are w...

Page 5: ...rtant to preserve the same sonic characteristics that distinquished the preamps I decided to try the Svetlana 6N1P dual triode and was pleasantly surprised to find that it is a wonderful sounding tube...

Page 6: ...r balanced Maximum Output Level 22 dBm unterminated Power Requirements 100 120 or 220 VAC 50 60Hz 25 W Dimensions 19 48 26cm W 5 25 13 34cm H 9 22 86cm D VT 2 13 22 9cm Weight 14 lbs 6 35 kg 1 SPECIFI...

Page 7: ...eps High Boost at 2 3 4 5 8 10 12 or 16 kHz 0 to 14 dB in 2 dB steps High Bandwidth Q of 0 6 0 8 1 0 1 4 or 1 7 High Frequency Cut at 1 7 4 10 or 28 kHz 0 to 14 dB shelving in 2 dB steps Gain adjustab...

Page 8: ...any other com ponents are custom made for the VT 4 All power supplies are solid state and fully regulated All rotary controls use high quality silver contact switches for precise repeatability and mat...

Page 9: ...slots are not blocked It is essential 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 In tight equipment enclosures be sure ther...

Page 10: ...ive voltage on pin 2 of the output Grounding and Shields A full discussion of proper studio wiring schemes is beyond the scope of this manual but in general the Input mating XLR connector must have th...

Page 11: ...d bridging input 20k ohms or greater When feeding a 600 ohm load there may be a slight degradation of some of the specifications In modern studio equipment bridging line inputs are uni versal If the d...

Page 12: ...or reducing noise The highest frequen cy setting 28 kHz is particulary useful for digital recording Attenuation in this range may help avoid effects common with anti aliasing filters in A D con verter...

Page 13: ...polystyrene or polypropylene types The rotary switches are semi sealed silver contact types selected for quiet operation and long life Output section The output amplifier is similar to the Input secti...

Page 14: ...Vacuum Tubes Four 6N1P tubes are used in the VT 4 V101 and V201 are the input stage and V102 and V202 are the output stages Tube life is difficult to predict but it will probably be measured in years...

Page 15: ...xit Caig Laboratories Follow the instructions provided with the product If the switches are not used regularly oxide and dirt can build up on the con tacts Rotate the switches through their range a fe...

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