Valve Amplifiers

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  • Edition: 4th
  • Format: Paperback
  • Copyright: 2012-07-30
  • Publisher: Elsevier Science Ltd

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Morgan Jones' Valve Amplifiers has been widely recognised as the most complete guide to valve amplifier design, modification, analysis, construction and maintenance written for over 30 years. As such it is unique in presenting the essentials of 'hollow-state' electronics and valve amp design for engineers and enthusiasts in the familiar context of current best practice in electronic design, using only currently available components. The author's straightforward approach, using as little maths as possible, and lots of design knowhow, makes this book ideal for those with a limited knowledge of the field as well as being the standard reference text for experts in valve audio and a wider audience of audio engineers facing design challenges involving valves. Design principles and construction techniques are provided so readers can devise and build from scratch designs that actually work. Morgan Jones takes the reader through each step in the process of design, starting with a brief review of electronic fundamentals relevant to valve amplifiers, simple stages, compound stages, linking stages together, and finally, complete designs. Practical aspects, including safety, are addressed throughout. The third edition includes a new chapter on distortion and many further new and expanded sections throughout the book, including: comparison of bias methods, constant current sinks, upper valve choice, buffering and distortion, shunt regulated push-pull (SRPP) amplifier, use of oscilloscopes and spectrum analysers, valve cooling and heatsinks, US envelope nomenclature and suffixes, heater voltage versus applied current, moving coil transformer source and load terminations. * The practical guide to analysis, modification, design, construction and maintenance of valve amplifiers * The fully up-to-date approach to valve electronics * Essential reading for audio designers and music and electronics enthusiasts alike

Table of Contents

Prefacep. ix
Dedicationp. xi
Acknowledgementsp. xiii
Circuit Analysis
Mathematical Symbolsp. 1
Electrons and Definitionsp. 2
Potential Dividersp. 14
Alternating Current (AC)p. 21
Active Devicesp. 41
Silicon Diodesp. 42
Bipolar Junction Transistors (BJTs)p. 45
General Observations on BJTsp. 52
Feedbackp. 53
The Operational Amplifierp. 56
Referencesp. 63
Recommended Further Readingp. 63
Basic Building Blocks
The Common Cathode Triode Amplifierp. 65
The Tetrodep. 86
The Beam Tetrode and the Pentodep. 88
The Cascodep. 94
The Charge Amplifierp. 102
The Cathode Followerp. 103
Sources and Sinks: Definitionsp. 107
The Common Cathode Amplifier as a Constant Current Sink (CCS)p. 109
The Cathode Follower with Active Loadp. 113
The White Cathode Followerp. 114
The -followerp. 118
The Shunt-Regulated Push-Pull Amplifier (SRPP)p. 125
The -followerp. 128
The Cathode-Coupled Amplifierp. 130
The Differential Pairp. 133
Semiconductor Constant Current Sinksp. 139
Referencesp. 153
Recommended Further Readingp. 154
Dynamic Range: Distortion and Noise
Distortionp. 155
Digital Conceptsp. 163
The Fast Fourier Transform (FFT)p. 166
Designing for Low Distortionp. 169
Signal Amplitudep. 169
Grid Currentp. 173
Distortion Reduction by Parameter Restrictionp. 177
Distortion Reduction by Cancellationp. 180
DC Bias Problemsp. 188
Individual Valve Choicep. 196
Coupling from One Stage to the Nextp. 207
Distortion and Negative Feedbackp. 219
Carbon Resistors and Distortionp. 222
Noisep. 222
Noise from Resistancesp. 223
Noise from Amplifying Devicesp. 224
Noise in DC Referencesp. 230
Referencesp. 236
Recommended Further Readingp. 237
Component Technology
Resistorsp. 239
General Considerations on Choosing Resistorsp. 248
Capacitorsp. 249
Different Types of Capacitorsp. 252
General Considerations in Choosing Capacitorsp. 269
Magnetic Componentsp. 272
Inductorsp. 273
Transformersp. 279
Why Should I Use a Transformer?p. 291
General Considerations in Choosing Transformersp. 292
Uses and Abuses of Audio Transformersp. 293
Thermionic Valvesp. 295
Individual Elements of the Valve Structurep. 299
Referencesp. 330
Recommended Further Readingp. 331
Power Supplies
The Major Blocksp. 333
Rectification and Smoothingp. 334
Regulatorsp. 378
Common-Mode Interferencep. 408
Practical Issuesp. 412
A Practical Designp. 417
Adapting the Power Supply to the EC8010 RIAA Stagep. 426
Referencesp. 433
Recommended Further Readingp. 434
The Power Amplifier
The Output Stagep. 435
Classes of Amplifiersp. 441
The Push-Pull Output Stage and the Output Transformerp. 443
Output Transformer-Less (OTL) Amplifiersp. 450
The Entire Amplifierp. 450
The Driver Stagep. 452
The Phase Splitterp. 454
The Input Stagep. 464
Stabilityp. 465
Classic Power Amplifiersp. 470
New Designsp. 480
Single-Ended Madnessp. 480
The Scrapbox Challenge Single-Ended Amplifierp. 480
Obtaining More Than Single Digit Output Powerp. 500
Driving Higher Power Output Stagesp. 504
The Crystal Palace Amplifierp. 505
The Bulwer-Lytton Scalable Parallel Push-Pull Amplifierp. 531
Referencesp. 545
Further Readingp. 546
The Pre-Amplifier
Input Selectionp. 548
Volume Controlp. 551
Balance Controlp. 568
Cable Driverp. 572
Tone Controlp. 579
Obtaining a Clean Signal from Analogue Discp. 585
RIAA Stage Designp. 591
A Simplified Example RIAA Stagep. 599
The EC8010 RIAA Stagep. 614
The Balanced Hybrid RIAA Stagep. 628
Referencesp. 646
Recommended Further Readingp. 646
Valve Datap. 647
Standard Component Valuesp. 651
Resistor Colour Codep. 651
Plastic Capacitor Codingp. 653
Cablep. 653
Square Wave Sag and Low Frequencyf-3 dBp. 654
Playing 78sp. 656
Equalisationp. 657
CDp. 659
Sourcing Components: Bargains and Dealing Directlyp. 660
Referencesp. 662
Indexp. 663
Table of Contents provided by Ingram. All Rights Reserved.

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