Product Description

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

Product Details

• Amazon Sales Rank: #156141 in Books
• Published on: 2003-11-12
• Original language: English
• Number of items: 1
• Binding: Paperback
• 640 pages

Review
"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 -- Review

Review
"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

Excerpt. © Reprinted by permission. All rights reserved.
The definitive modern guide to tube amplifiers for home and professional audio applications.

Customer Reviews

The new reference for modern tube audio design
Fifteen years ago, tubes (valves to the rest of the world) were not only out of style, they were almost extinct. The same went for vinyl records. But there were always a few people that didn't buy into the new technology, insisting that tube electronics sounded more in step with the music. I heard my first high end tube amp (a Conrad Johnson MV-45) in 1987 and I've been hooked on the sound ever since. Thanks to a series of events that few could have forseen, the DIY tube revolution is in full swing. The fall of Communism and China embracing capitalism opened the flood gates, making more tube types cheaply available than since the mid-sixties. Add the internet with it's flow of information, and the underground DIY audio scene was born. There's an embarassment of riches now available to the amateur Hi-Fi enthusiast, and this volume is one of the best.

I've owned the first edition of this book for several years and it's absolutely great. It was a logical step up from my first DIY tube amp book, Bruce Rosenblitt's Beginners Guide to Tube Audio Design (now out of print). The first edition clocked in at 300+ information packed pages, covering everything from the performance of different electronic components used in tube amps, amp and preamp projects to chassis construction and design. When the second edition came out, I decided not to buy it thinking it maybe corrected some errors and had some new projects. Now that I've read the third edition, I have a funny feeling that I've missed out. See, the new edition is over SIX HUNDRED pages long, and that's without the amplifier construction section! The amplifier construction techniques are now covered in Mr. Jones' companion volume, Building Valve Amplifiers, in itself a 300+ page book. What this means is if you include the companion volume, there's THREE TIMES the information than in the first edition, over a thousand pages! Not only is there more, but it's better organized and edited than the first edition.

Morgan Jones covers just about every tube related subject, not hesitating to offer his opinions along the way. He doesn't hide his dislike for some current tube audio trends, such as tube power supply regulators and single ended amplifiers. There's a single ended amplifier project in the book, and while it's not a 300B amp project (he rightly says there are enough of those around), he goes through the project with all the thoroughness and care we've come to expect. There are several other projects, including a tube headphone amp, the author's original EL84 amp, a more powerful push-pull amp using 13E1 output tubes, his original "practical pre amplifier" from his first edition, plus a balanced preamp and a new line preamp and phono stage.

The wonderful thing about the projects in this book is that the author doesn't just present the schematic and say "build this", he goes through every step from tube and component selection to each design choice along the way. This isn't just a project book, this is a book that teaches you how to actually design an amp. I haven't built any of the designs in the book (yet), but I have no doubt that they sound very, very good indeed. And for vinyl enthusiasts, the amount of time spent explaining phono preamps is an absolute treasure. You won't find this information anywhere else!

Yeah, it's an expensive book, but worth every penny. The bottom line is this - if you're interested in DIY vacuum tube electronics and don't have this book and it's companion volume, you're limiting yourself. I think even crusty old timers that have been working with tubes for years could learn something from this book. If you've learned everything this book and it's companion volume have to offer, I believe that you could build tube audio electronics that compare to the best that are available, regardless of price.

Good for beginners, but minor misconceptions put me off.
If you don't know much about valve amplifiers ['valve' = `tube' in USA], you will learn a lot by reading this book, which starts from the basics. It is generally readable and easy to understand. In addition to theory, it also covers some very practical aspects the practical [how to cut metal, how to solder, and so on]. The author's style is highly enthusiatic but came across to me as being slightly amateurish.

Its focus is on hi-fi audio amplifiers - it does not touch on valve guitar amplifiers.

What I liked most was the author's down-to earth common sense approach, which he evidently acquired through his training at the BBC. [no nonsense about gold plating your mains fuses here]

What I liked *least* were minor misconceptions and the details he gets wrong here and there. As a few examples, if you took him at his word, you would believe:

- Fitting metal screening to an input valve will shorten its life.

- The B-H curve of a transformer's iron can be treated as the Vin - Vout characteristic.

- The getter in a valve is only effective if the heater is hot before the anode voltage is applied.

Two topics I thought were significant omissions:

- How to measure amplifier characteristics [eg frequency response, power output, distortion].

- How to design feedback amplifiers to get the best performance for a given output transformer.

Troubleshooting [a pretty important topic] is only touched on.

As I said, if you don't know much about valve amplifiers, you can learn a lot from this book and will find it easy to read with lots of useful information. But if [like me] you are put off by incorrect details and a slightly amateurish air, leave it on the bookshelf.

Fills several niches well
I give Jones high marks for several reasons:

1) Comprehensive coverage of vacuum tube phono (RIAA) preamp design and optimization, the best in or out of print as far as I know;

2) Overall organization and breadth;

3) Technical explanation at a useful (not excruciatingly hard but not oversimplified) level;

4) Readable style.

While I am not as committed a believer as Jones is to the supremacy of push-pull amplification, I recommend this book frequently and with enthusiasm.

Is it perfect, the best possible book for the tube audio enthusiast ever to be written? No.

Is it the best book available? A resounding yes.

-j