2 internautes sur 2 ont trouvé ce commentaire utile
- Publié sur Amazon.com
This book is huge. In terms of page area it is 10% larger than the Radio Designer's Handbook 4th edition, and yet, amazingly, it covers very little ground indeed. The material included is no more than basic-to-intermediate in level. You can get much, much more info from Morgan Jones and Menno Van der Veen's books, even though they are smaller and cheaper.
To give an idea of what is covered, it is probably more eye-opening to list some of the things this book does NOT cover:
Voltage regulators (except one for heaters)
Active loads / constant-current sources and sinks
Volume / balance / tone controls
Phono amplifiers / RIAA equalisation
Proper ground schemes (except for one page).
Most of this book is in fact taken up by unnecessarily large figures, fonts and line spacings. Oh, and not forgetting the PAGES AND PAGES OF DERIVATIONS. Most of the time you will find yourself sweeping through many consecutive pages of derivations with virtually no discussion or explanation of why or what is happening, and virtually no clearly articulated conclusion. This stuff should be put in an appendix.
Solid-state components are more-or-less banned by the author as being evil, or something. Even silicon rectifiers are off limits, except for heater and bias supplies where they are apparently OK!?
The translation from the original Dutch is pretty variable. Some passages are broken or even impossible to follow, and many common terms are given weird names like:
Anode Static Steepness (instead of transconductance)
Linear distortion (instead of phase distortion)
Phase Shifter (instead of phase splitter/inverter)
Basic Cathode Circuit (instead of common-cathode amplifier)
Cathodedyne (instead of cathodyne)
SRPP (he makes the rookie error of not knowing the difference between an SRPP and a half-mu stage. There are no SRPPs in this book)
In particular, I wanted to learn about the author's apparently original method for determining optimum ultra-linear tappings, but this section is either so badly written or translated that the method -if any- is impossible to determine.
Referencing is sometimes strange, most of it coming from Menno Van der Veen's books. Sometimes he attributes very old and well-known techniques to articles written by hobbyists in Glass Audio and the like!
This book does not seem to know who it is aimed at. It is far too dense and mathemetical for beginners, but the actual info is too basic for advanced readers. Altogether it feels like it has been written by someone who is himself a well-meaning, self-taught hobbyist who has collected all his knowledge -even the irrelevant stuff- in one place and wants to emulate an academic textbook, but does not have access to many original papers and books. Almost like an oversized undergraduate thesis. These things would all be forgivable in a low-cost self-published book, but I would not have expected a reputable house like Elektor to have agreed to publishing it.
1 internautes sur 1 ont trouvé ce commentaire utile
- Publié sur Amazon.com
Scatter shot organization, uneven depth, eye wearying typesetting, difficult translation. Altogether I was so put off I spent less than 10 minutes with it after paying nearly $100. Morgan Jones's book Valve Amplifiers, Third Edition is still the best modern reference in the field.
- Publié sur Amazon.com
After reading some unflattering reviews on Amazon I waited a few years for the price of this book to drop to a $30 something level and then bought it. Overall, a huge and heavy book, which makes its main weakness obvious - the author goes into pages and pages of mostly unnecessary maths and calculations, does not simplify anything. He treats the subject from a typically academic approach - the more maths, the better. So, if you maths skills aren't up to scratch, skip this book, you'll get lost, confused, irritated or all of the above.
This is not a book for builders of tube amps, but aimed, it seems, mostly at designers and those who want to understand the maths and physics of it all.
There are good sides of the book, too. The author isn't flippant, he doesn't dismiss this or ignore that, he covers almost everything. As some reviewers already pointed out, some practical issues and circuits aren't covered, true, so it is not the most practical or comprehensive of manuals (it doesn't claim to be anyway, it is after all called "Fundamental ..."), but what is there is analyzed inside and out, up and down, in all directions, in any possible way. I haven't seen so many calculations in any book on tube technology.
So, while the book is certainly worth its current low price (but not its original price of $100 or thereabouts) and while it isn't a total miss like some others, it will only suit mathematically and theoretically inclined readers.