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Manual D.W. Fearn VT-15

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  • D.W. Fearn VT-15 - page 1

    VT-15 Vacuum Tube Recording Channel Operating Instructions D.W. FEARN ...

  • D.W. Fearn VT-15 - page 2

    D.W. FEARN VT-15 Recording Channel Ho w to Cont act us: T elephone: 6 1 0-793-2526 F ax: 6 1 0-793- 1 479 Mail: P .O. Bo x 57 , P ocopson, P A 1 9366 U .S.A. Shipping A ddress: 1 82 Bragg Hill R oad W est Chester , P A 1 9382 U .S.A. e-mail: dwf ear n@dwf ear n.com www .dwf ear n.com ...

  • D.W. Fearn VT-15 - page 3

    D . W . F EARN H AND - CR AFTED PR OFESSION AL RECORDIN G EQUIPMENT www .dwfear n.com P .O. Bo x 57 P ocopson, P A 1 9366 U .S.A. T el: 6 1 0-793-2526 F ax: 6 1 0-793- 1 479 Cer tificate of RoHS Compliance D.W . F ear n is committed to manuf acturing pr oducts t hat ar e fully-com pliant wit h t he EU R oHS Dir ectiv e. The f ollo wing pr oducts ar ...

  • D.W. Fearn VT-15 - page 4

    4 ...

  • D.W. Fearn VT-15 - page 5

    D.W. FEARN VT-15 Recording Channel 5 VT-15 Vacuum Tube Recording Channel Final Test Report Serial Number_______________ Mains Voltage 120/240 set to __________________ Date ________________ Tested by ________ VU Calibrated to _______________ dBm Test Equipment ____________________________ Microphone ________________________ Frequency Response: 20 c ...

  • D.W. Fearn VT-15 - page 6

    D.W. FEARN VT-15 Recording Channel 7 Table of Contents R oHS Com pliance Dat a .................................................................. 3 Final T est R epor t ............................................................................ 5 W ar ranty ........................................................................................ 9 ...

  • D.W. Fearn VT-15 - page 7

    D.W. FEARN VT-15 Recording Channel 8 D.W . F ear n shall not be liable f or technical or editorial er r ors or omissions in t his manual, nor f or incident al or consequential damag es r esulting fr om t he use of t his material. This instr uction manual cont ains inf or mation pr otected b y cop yright. N o par t of t his manual ma y be photocopie ...

  • D.W. Fearn VT-15 - page 8

    D.W. FEARN VT-15 Recording Channel 9 Limited 5-Year Warranty During t he w ar ranty period, D.W . F ear n will, at no additional char g e, r epair or r eplace def ectiv e par ts wit h ne w par ts. This w ar ranty does not extend to an y VT - 1 5 t hat has been damag ed or r ender ed def ectiv e as a r esult of accident, misuse, or abuse; b y t he u ...

  • D.W. Fearn VT-15 - page 9

    D.W. FEARN VT-15 Recording Channel 11 History of the VT-15 Vacuum Tube Recording Channel W it h t he success of t he VT - 1/VT -2 V acuum Tube Micr ophone Pr eam plifiers, t he VT - 4 LC Equalizer , t he VT -7 Ster eo Com pr essor , and t he VT -I/F and VT -3 V acuum Tube DIs, t her e w as a gr eat tem pt ation to combine t he f eatur es of all of ...

  • D.W. Fearn VT-15 - page 10

    D.W. FEARN VT-15 Recording Channel 12 ...

  • D.W. Fearn VT-15 - page 11

    D.W. FEARN VT-15 Recording Channel 13 Mic Input 150 ohms Input Load Impedance 1.5k ohms Minimum Input Level -65 dBm nominal Maximum Input Level @ 20 cps -30 dBm without pad -5 dBm with 20 dB pad Instrument Input impedance 1 Megohm Line Input Load Impedance 40k ohms Maximum Line Input Level @ 20 cps +25dBm (+35dBm with pad) Gain <60 dB optimum (c ...

  • D.W. Fearn VT-15 - page 12

    D.W. FEARN VT-15 Recording Channel 14 Compression Range up to 30dB Compression method Pulse-width modulator Equalizer: Low-frequency Boost 100 cps, shelving Low-frequency Cut 80 cps, shelving High-frequency Boost 9.8 kc, peaking High-frequency Q 0.6 to 1.7 High-frequency Cut 12 kc, shelving Power Requirements 100, 120, or 220 V AC 50/60Hz, 50 W Dim ...

  • D.W. Fearn VT-15 - page 13

    D.W. FEARN VT-15 Recording Channel 15 2. DESCRIPTION The D.W . F ear n VT - 1 5 utilizes cir cuitr y de v eloped f or t he VT - 1/VT -2 V acuum Tube Micr ophone Pr eam plifiers, t he VT -7 Ster eo Com pr essor , and t he VT -4 LC Equalizer . The Model VT - 1 5 R ecor ding Channel is designed to pr o vide r ecor ding pr of essionals wit h a sonicall ...

  • D.W. Fearn VT-15 - page 14

    D.W. FEARN VT-15 Recording Channel 16 ...

  • D.W. Fearn VT-15 - page 15

    D.W. FEARN VT-15 Recording Channel 17 3. INST ALL A TION The VT - 1 5 is car efully pack ed f or shipment and it should surviv e all but t he most br ut al han - dling. If t her e is an y damag e, k eep t he shipping material f or use during an y possible claim f or damag e wit h t he shipper . Included in t he bo x: 1) The VT - 1 5 R ecor ding Cha ...

  • D.W. Fearn VT-15 - page 16

    D.W. FEARN VT-15 Recording Channel 18 t he back panel f or inst allations t hat use separate chassis gr ounding. If gr ound loop hum is detected, a car eful check of t he studio gr ounding scheme is needed. The VT - 1 5 is less suscep - tible to gr ounding pr oblems t han man y studio de vices. Connections The INPUT connector is a XLR-3 f emale wir ...

  • D.W. Fearn VT-15 - page 17

    D.W. FEARN VT-15 Recording Channel 19 4. OPER A TION INITIAL SET-UP IS CRITICAL for getting the best performance from your VT-15! The VT - 1 5 has tr emendous v ersatility , but wit h t hat v ersatility comes t he potential f or f or v er y un pleasant sound. Think of t he VT - 1 5 as a small studio chain in one bo x: mic pr eam p, com - pr essor , ...

  • D.W. Fearn VT-15 - page 18

    D.W. FEARN VT-15 Recording Channel 20 Control Set-up In put togg le switches: Mic/Line switch - as appr opriate f or t he sour ce 0/-20 switch - 0 1 50/Lo-Z switch - 1 50 (unless y ou ar e using a non-st andar d im pedance mic) +48 switch - on f or phantom-po w er ed condenser mics, ot her wise off R e v/Phase switch - do wn (no phase r e v ersal) ...

  • D.W. Fearn VT-15 - page 19

    D.W. FEARN VT-15 Recording Channel 21 6. A djust t he Eq contr ols f or t he desir ed sound. (R emember to use t he Boost and Cut tog et h- er to shape t he sound.) 7 . Switch t he VU meter back to t he VU position. 8. A djust t he Gain contr ol f or a nor mal indication. P eak s should rar ely go into t he r ed (0VU). This pr ocedur e will pr o vi ...

  • D.W. Fearn VT-15 - page 20

    D.W. FEARN VT-15 Recording Channel 22 C ONTR OLS (see Figure 1 .) The VT - 1 5 fr ont panel is divided into t hr ee main ar eas of contr ols. On t he left is t he In put sec - tion, to its right is t he Com pr essor section, fur t her right is t he Equalizer section, and f ar right is t he output and po w er section. Input Toggle Switch Section The ...

  • D.W. Fearn VT-15 - page 21

    D.W. FEARN VT-15 Recording Channel 23 es t he polarity of t he output of t he VT - 1 5. A det ailed discussion of t he application of phase re v ersal of individual micr ophones is be y ond t he scope of t his manual. Ev en when t her e is only one micr ophone being r ecor ded, it ma y be useful to tr y t he “R ev erse” position of t he Phase c ...

  • D.W. Fearn VT-15 - page 22

    D.W. FEARN VT-15 Recording Channel 24 add distor tion to lo w fr equency sounds. (This is tr ue of all com pr essors.) A f ast r elease time adds density to t he sound, often wit h t he com pr ession becoming mor e obvious. Long r elease times mak e t he com pr ession less obvious and mor e natural, but can “punch holes” in t he lo w er le v el ...

  • D.W. Fearn VT-15 - page 23

    D.W. FEARN VT-15 Recording Channel 25 should r esult in “0 VU” on a pr operly aligned r ecor der . (This r ef er ence le v el can be chang ed; see t he Maintenance Section.) This is a tr ue VU meter , and conf or ms to AS A St andar d C1 6.5- 1 954. In t he GR position, t he VU meter monitors t he amount of g ain r eduction (com pr ession). As ...

  • D.W. Fearn VT-15 - page 24

    D.W. FEARN VT-15 Recording Channel 26 1 . Use t he best quality mic cable y ou can. W e don’t belie v e y ou ha v e to use esoteric wir e, but do use a good cable designed f or lo w im pedance micr ophones. A quality cable wit h gold-cont act connectors is best. 2. Ther e should be no additional cables, connectors, junction bo x es, patch jack s, ...

  • D.W. Fearn VT-15 - page 25

    D.W. FEARN VT-15 Recording Channel 27 5. THEOR Y OF OPER A TION Preamp Section Input section Micr ophone le v el (1 50 ohm sour ce im pedance, balanced, -50 dBm nominal) or line le v el (600-ohm sour ce, +4dBm nominal) audio enters t hr ough t he XLR-3 f emale INPUT connec - tor to t he In put selector switch bank. In t he 0 position, t he in put i ...

  • D.W. Fearn VT-15 - page 26

    D.W. FEARN VT-15 Recording Channel 28 r esponse, lo w phase shift, ex cellent squar e w av e r esponse, lo w distor tion, and high noise immunity . The secondar y of is connected dir ectly to t he grid of t he first am plifier st ag e. First stage The first st ag e is a selected 6072 configur ed as a Class A v olt ag e am plifier wit h a g ain of a ...

  • D.W. Fearn VT-15 - page 27

    D.W. FEARN VT-15 Recording Channel 29 VU Meter and Meter Amplifier A tw o-st ag e IC operational am plifier is used to isolate t he VU meter fr om t he VT - 1 5 output. An output sam ple is deriv ed fr om t he primar y of t he output transf or mer . The meter calibra - tion is set wit h a 20-tur n trimmer potentiometer . R ef er ence le v el (0 VU) ...

  • D.W. Fearn VT-15 - page 28

    D.W. FEARN VT-15 Recording Channel 30 ...

  • D.W. Fearn VT-15 - page 29

    D.W. FEARN VT-15 Recording Channel 31 6. MAINTENANCE The VT - 1 5 is built wit h only t he highest quality par ts and will pr o v e to be extr emely r eliable. V acuum tubes and electr olytic capacitors, ho w ev er , ha v e a finite useful lif e and must be r eplaced e v entually . Top Cover Removal R emo ving t he top co v er allo ws access to t h ...

  • D.W. Fearn VT-15 - page 30

    D.W. FEARN VT-15 Recording Channel 32 Tubes also sometimes de v elop a micr ophonic r esponse — t he y will r espond to ambient noise and vibration. This can be an insidious pr oblem since measur ements in a quiet r oom will indi - cate per f ect per f or mance. Gently t apping t he tube shields while listening to t he output at a nor mal monitor ...

  • D.W. Fearn VT-15 - page 31

    D.W. FEARN VT-15 Recording Channel 33 Troubleshooting Most pr oblems will be traced to def ectiv e v acuum tubes. Ho w e v er , if nor mal tests do not eas - ily r e v eal t he pr oblem, f eel fr ee to call t he f actor y f or assist ance. If y ou lack access to a qual - ified service technician wit h v acuum tube equipment r epair experience, y ou ...

Manufacturer D.W. Fearn Category Stereo Amplifier

Documents that we receive from a manufacturer of a D.W. Fearn VT-15 can be divided into several groups. They are, among others:
- D.W. Fearn technical drawings
- VT-15 manuals
- D.W. Fearn product data sheets
- information booklets
- or energy labels D.W. Fearn VT-15
All of them are important, but the most important information from the point of view of use of the device are in the user manual D.W. Fearn VT-15.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals D.W. Fearn VT-15, service manual, brief instructions and user manuals D.W. Fearn VT-15. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product D.W. Fearn VT-15.

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A complete manual for the device D.W. Fearn VT-15, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use D.W. Fearn VT-15 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of D.W. Fearn VT-15.

A complete D.W. Fearn manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual D.W. Fearn VT-15 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the D.W. Fearn VT-15, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the D.W. Fearn VT-15, that we can find in the current document
3. Tips how to use the basic functions of the device D.W. Fearn VT-15 - which should help us in our first steps of using D.W. Fearn VT-15
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with D.W. Fearn VT-15
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of D.W. Fearn VT-15 in a specific country, if it was not possible to solve the problem on our own.

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