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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.
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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.
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