Building Valve Amplifiers PDF
Preview Building Valve Amplifiers
//SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–1–[1–8/8]5.5.200411:48AM Building Valve Amplifiers This Page is Intentionally Left Blank //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–3–[1–8/8]5.5.200411:48AM Building Valve Amplifiers Morgan Jones · · · AMSTERDAM BOSTON HEIDELBERG LONDON · · · NEW YORK OXFORD PARIS SAN DIEGO · · · SAN FRANCISCO SINGAPORE SYDNEY TOKYO Newnes is an imprint of Elsevier //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–4–[1–8/8]5.5.200411:48AM Newnes AnimprintofElsevier LinacreHouse,JordanHill,OxfordOX28DP 200WheelerRoad,Burlington,MA01803 Firstpublished2004 Copyright(cid:1)2004,MorganJones.Allrightsreserved TherightofMorganJonestobeidentifiedastheauthorofthisworkhas beenassertedinaccordancewiththeCopyright,DesignsandPatentsAct1988 Allphotographs(includingfrontcover)byMorganJones Nopartofthispublicationmaybereproducedinanymaterialform(including photocopyingorstoringinanymediumbyelectronicmeansandwhether ornottransientlyorincidentallytosomeotheruseofthispublication)without thewrittenpermissionofthecopyrightholderexceptinaccordancewiththe provisionsoftheCopyright,DesignsandPatentsAct1988orunderthetermsof alicenceissuedbytheCopyrightLicensingAgencyLtd,90TottenhamCourtRoad, London,EnglandW1T4LP.Applicationsforthecopyrightholder’swritten permissiontoreproduceanypartofthispublicationshouldbeaddressed tothepublisher. PermissionsmaybesoughtdirectlyfromElsevier’sScienceandTechnology RightsDepartmentinOxford,UK:phone:(þ44)(0)1865843830; fax:(þ44)(0)1865853333;e-mail:[email protected] completeyourrequeston-lineviatheElsevierhomepage(http://www.elsevier.com), byselecting‘CustomerSupport’andthen‘ObtainingPermissions’. BritishLibraryCataloguinginPublicationData Jones,Morgan Buildingvalveamplifiers 1. Audioamplifiers–Designandconstruction 2. Audio amplifiers–Maintenanceandrepair I. Title 621.3081535 ISBN0750656956 LibraryofCongressCataloguinginPublicationData AcataloguerecordforthisbookisavailablefromtheLibraryofCongress ForinformationonallNewnespublications visitourwebsiteathttp://books.elsevier.com TypesetbyIntegraSoftwareServicesPvt.Ltd,Pondicherry,India. www.integra-india.com PrintedandboundinGreatBritain Working together to grow libraries in developing countries www.elsevier.com | www.bookaid.org | www.sabre.org //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–5–[1–8/8]5.5.200411:48AM C ONTENTS Preface vi Acknowledgements viii Part 1 Construction 1 1 Planning 3 2 Metalwork for poets 57 3 Wiring 94 Part 2 Testing 169 4 Test equipment principles 171 5 Faultfinding to fettling 258 6 Performance testing 306 Index 349 v //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–6–[1–8/8]5.5.200411:48AM P REFACE This practical book is intended to bridge the gap between a theoretical circuit diagram and relaxing to the sound of a reliable, well-built amplifier. It is the complement to ‘‘Valve Amplifiers’’ (which has equations in it). Onepossiblewayofbuildinganamplifieristochoosethemost expensive components on offer, then assemble them on a cus- tom-built chassis using that year’s choice of designer wire. However, the author assumes that you are holding this book becauseyouwanttoknowhowtobuildavalveamplifierthatis significantly better than you could afford for the same price ready-made.Forthatreason,someofthephysicsthatyouslept through at school will reappear, but with the valuable bonus that it will allow you to make reasoned choices that improve quality or save money – possibly both. It is undoubtedly easier to do metalwork in a fully equipped machine shop, complete with folding machine, drill press, lathe,mill, andcopious handtools.Nevertheless,itis perfectly possibletodogoodworkwithapowerdrillinastandandafew carefully selected hand tools. In addition to the standard tech- niques, a number of ‘‘cheats’’ will be shown that allow you to produceworkofastandardthatappearstohavebeendoneby aprecisionmachineshop.Thiswillenableyourcreationtobea thing of beauty that can be proudly displayed. Therulesforgoodaudioconstructionarenotcomplex.It’sjust thatthereareratheralotofthem.Oncethelogicisunderstood, a good layout comes naturally. vi //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–7–[1–8/8]5.5.200411:48AM PREFACE Eventhemostcarefullyconsidereddesignsneedalittle fettling once built. Test equipment ranges from cheap DVMs to oscil- loscopes andspectrumanalyserswith Gigahertzof bandwidth, to PC-based virtual instruments. They all cost money, but if youunderstandtheoperatingprinciples,youcanchoosewhich featuresareworthpayingfor,whichcanbesafelyignored,and how to use what you can afford to its best advantage. Startlingly, years of experience don’t make the author any less frightened at the instant of first switch-on. Accidents do hap- pen, but there are ways of minimising the quantity of smoke. Sometimes, an amplifier is stubborn and just doesn’t quite work properly, requiring genuine faultfinding. This book is distilled from years of bludgeoning recalcitrant electronics, thumping metal, and sucking teeth at the price of test equipment... vii //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIER UK/BVA/3B2/REVISES_23-04-04/0750656956-CH000-PRE- LIMS.3D–8–[1–8/8]5.5.200411:48AM A CKNOWLEDGEMENTS Many individuals and organizations have assisted in the prep- aration of this book. Some even knew that they were doing so. Inspiration came from a variety of sources. Some, simply because they asked significant questions, others because they displayed good technique, others because they generously made equipment available for photography, and yet others because they demonstrated techniques to be avoided... In particular, the author would like to thank Paul Leclerq for proofreading (once again), and for the varied and generous assistance given by Brian Terrell. viii //SYS21///INTEGRAS/ELS/PAGINATION/ELSEVIERUK/BVA/3B2/REVISES_23-04-04/0750656956-CH001.3D–1 –[1–56/56]5.5.200411:45AM P I ART C ONSTRUCTION
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