Valve Amplifiers book cover

Valve Amplifiers

Valve Amplifiers has been recognized as the most comprehensive guide to valve amplifier design, analysis, modification and maintenance. It provides a detailed presentation of the rudiments of electronics and valve design for engineers and non-experts. The source also covers design principles and construction techniques to help end users build their own tool from scratch designs that work. The author's approach walks the reader through each step of designing and constructing, starting with an overview of the essential working principles of valve amplifiers, the simple and complex stages, the process of linking the stages, and completing the design. The book is comprised of seven chapters all of which include a DIY guide discussion of practical aspects. The text starts with familiarization of the fundamentals of electronics, which are essential for designing and building valve amplifiers. Particular attention has been paid to providing solutions for questions that are commonly asked and faced by beginners in valve designing and construction. Valve Amplifiers is a masterful hands-on guide for both experts and novices who work with tube audio equipment, and for electronic hobbyists, audio engineers, and audiophiles.

Amateur and professional valve audio designers and enthusiasts.

Paperback, 700 Pages

Published: November 2011

Imprint: Newnes

ISBN: 978-0-08-096640-3


  • "Jam-packed with theory, circuit analysis, and DIY basics, it will walk you through all stages of design so that you can create your own wonders. Jones is an ex-BBC engineer with a cool writing style and you'll find it a no-pain education." Hi-Fi News and Record Review "Valve Amplifiers is an extremely well-written book, containing a wealth of information that all audio designers and builders will find useful." Glass Audio "Many still hanker after the traditional warm valve sound from a hi-fi, and if you're handy with a soldering iron and not afraid of HT voltages, the Jones' book could keep you amused for hours. Filled with designs, tips, and information on every aspect of valve power amplifiers, a basic knowledge of electronics and metalwork is all you'll need to get the most from this (relatively) ancient technology." Lighting & Sound


  • Preface



    1. Circuit Analysis

        Mathematical Symbols

        Electrons and Definitions

        Potential Dividers

        Alternating Current (AC)

        Active Devices

        Silicon Diodes

        Bipolar Junction Transistors (BJTs)

        General Observations on BJTs


        The Operational Amplifier


        Recommended Further Reading

    2. Basic Building Blocks

        The Common Cathode Triode Amplifier

        The Tetrode

        The Beam Tetrode and the Pentode

        The Cascode

        The Charge Amplifier

        The Cathode Follower

        Sources and Sinks: Definitions

        The Common Cathode Amplifier as a Constant Current Sink (CCS)

        The Cathode Follower with Active Load

        The White Cathode Follower

        The μ-follower

        The Shunt-Regulated PushPull Amplifier (SRPP)

        The β-follower

        The Cathode-Coupled Amplifier

        The Differential Pair

        Semiconductor Constant Current Sinks


        Recommended Further Reading

    3. Dynamic Range: Distortion and Noise


        Digital Concepts

        The Fast Fourier Transform (FFT)

        Designing for Low Distortion

        Signal Amplitude

        Grid Current

        Distortion Reduction by Parameter Restriction

        Distortion Reduction by Cancellation

        DC Bias Problems

        Individual Valve Choice

        Coupling from One Stage to the Next

        Distortion and Negative Feedback

        Carbon Resistors and Distortion


        Noise from Resistances

        Noise from Amplifying Devices

        Noise in DC References


        Recommended Further Reading

    4. Component Technology


        General Considerations on Choosing Resistors


        Different Types of Capacitors

        General Considerations in Choosing Capacitors

        Magnetic Components



        Why Should I Use a Transformer?

        General Considerations in Choosing Transformers

        Uses and Abuses of Audio Transformers

        Thermionic Valves

        Individual Elements of the Valve Structure


        Recommended Further Reading

    5. Power Supplies

        The Major Blocks

        Rectification and Smoothing


        Common-Mode Interference

        Practical Issues

        A Practical Design

        Adapting the Power Supply to the EC8010 RIAA Stage


        Recommended Further Reading

    6. The Power Amplifier

        The Output Stage

        Classes of Amplifiers

        The PushPull Output Stage and the Output Transformer

        Output Transformer-Less (OTL) Amplifiers

        The Entire Amplifier

        The Driver Stage

        The Phase Splitter

        The Input Stage


        Classic Power Amplifiers

        New Designs

        Single-Ended Madness

        The Scrapbox Challenge Single-Ended Amplifier

        Obtaining More Than Single Digit Output Power

        Driving Higher Power Output Stages

        The Crystal Palace Amplifier

        The Bulwer-Lytton Scalable Parallel PushPull Amplifier


        Further Reading

    7. The Pre-Amplifier

        Input Selection

        Volume Control

        Balance Control

        Cable Driver

        Tone Control

        Obtaining a Clean Signal from Analogue Disc

        RIAA Stage Design

        A Simplified Example RIAA Stage

        The EC8010 RIAA Stage

        The Balanced Hybrid RIAA Stage


        Recommended Further Reading


        Valve Data

        Standard Component Values

        Resistor Colour Code

        Plastic Capacitor Coding


        Square Wave Sag and Low Frequency f-23 dB

        Playing 78s



        Sourcing Components: Bargains and Dealing Directly




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