D.W. Fearn VT-2 Instrucciones de operaciones

VT-7Vacuum TubeCompression AmplifierOperating InstructionsD.W. FEARN

D.W. FEARN VT-7 Compression Amplifier131 .SPECIFICATIONS (measurements are made with +4dBm input and output, no compression, into a bridging load)

D.W. FEARN VT-7 Compression Amplifier152.DESCRIPTIONThe Model VT-7 Vacuum Tube Compression Amplifier is designed to provide recording pro-fessionals w

D.W. FEARNVT-7 Compression Amplifier16

D.W. FEARN VT-7 Compression Amplifier173.INSTALLATION The VT-7 is carefully packed for shipment and it should survive all but the most brutal han-dlin

D.W. FEARNVT-7 Compression Amplifier18PowerThe VT-7 is designed to operate from 100, 120, or 220-240 volt, 50/60 Hz power. The unitwill be shipped for

D.W. FEARN VT-7 Compression Amplifier194.OPERATIONInputSince the input cable will be carrying high quality audio, it is important that a well-shielded

D.W. FEARNVT-7 Compression Amplifier20CONTROLS (see Figure 2.)Threshold The Threshold control adjusts the point where compression begins. With the con

D.W. FEARN VT-7 Compression Amplifier21You can run a stereo signal with the switch in the Separate position for an effect. On a stereopair such as a p

D.W. FEARNVT-7 Compression Amplifier22For 100 volt operation, internal wiring changes must be made. Contact the factory if thisbecomes necessary.Units

D.W. FEARN VT-7 Compression Amplifier23Semi-professional equipment frequently uses a reference level of -10 dBv (roughly 14 dBlower than pro equipment

D.W. FEARNVT-7 Compression AmplifierHow to Contact us:Telephone: 610-793-2526Fax: 610-793-1479Mail: P.O. Box 57, Pocopson, PA 19366 U.S.A.Shipping Add

D.W. FEARN VT-7 Compression Amplifier255.THEORY OF OPERATION Input sectionLine level (low source impedance, balanced, +4 dBm nominal) audio enters thr

D.W. FEARNVT-7 Compression Amplifier26Second stageThe output of the first stage is coupled to the grid of the second stage through a polypropy-lene ca

D.W. FEARN VT-7 Compression Amplifier276.MAINTENANCE The VT-7 is built with only the highest quality parts and will prove to be extremely reliable.Vac

D.W. FEARNVT-7 Compression Amplifier28Although you could purchase a batch of 6072A tubes and select the quietest one(s), it maybe cost effective to bu

D.W. FEARN VT-7 Compression Amplifier29Gain Reduction meter calibrationThe adjustments for the VU meter “0” calibration in the “GR” position are locat

Certificate of RoHS ComplianceD.W. Fearn is committed to manufacturing products that are fully-compliant withthe EU RoHS Directive.The following produ

D.W. FEARN VT-7 Compression Amplifier5VT-7 Vacuum Tube Compression AmplifierFinal Test ReportModel _______________ Serial Number_______________Mains

D.W. FEARN VT-7 Compression Amplifier7Table of ContentsFinal Test Report ...3

D.W. FEARNVT-7 Compression Amplifier8D.W. Fearn shall not be liable for technical or editorial errors or omissions in thismanual, nor for incidental o

D.W. FEARN VT-7 Compression Amplifier9Limited 5-Year WarrantyDuring the warranty period, D.W. Fearn will, at no additional charge, repair or replacede

D.W. FEARN VT-7 Compression Amplifier11History of the VT-7 Compression AmplifierCompression (or limiting) is sometimes seen as a necessary evil in the

D.W. FEARNVT-7 Compression Amplifier12A look inside the VT-7 reveals a very full box with several densely-packed circuit boards forthe gain control dr