The good news is, Weber tells you what a lot of the components in an amplifier do in terms that can be understood. E.G., leaving this capacitor out of a triode pre-amp circuit reduces the amplification of that circuit, and creates compression. Using the correct value on that resistor will set the DC current to exactly halfway between saturation (the maximum current that could possibly flow through the tube) and cutoff (the point at which NO current flows through the tube) is how one sets the bias of that tube. There's a lot of useful information for somebody who wants to understand what's going on.
The bad news is, he doesn't always complete the job. Some of his explanations really *aren't* for beginners: they presume prior knowledge. Well, if you had that to begin with, you probably didn't need his explanation. Or, the part you didn't understand is explained elsewhere, and you'll have to piece it all together when you get to that part. Sometimes the figure he describes, which WAS there (I assume) in the original article describing how a pentode circuit operates, didn't get included in the book. That's simple oversight, and it rightfully comes across as half-fast. As he explains, he writes a monthly column for a guitar magazine and, when enough of those articles accumulate, he puts them in a new book. So, this book isn't organized, start to finish, to take you from one level of knowledge to another.
With that caveat aside, I really do like it when he explains things in a simple, useful way. Quite often, the way he does that makes it possible to arrive at a big picture. I AM accumulating knowledge in a piecemeal way, that I will need to organize on my own to arrive at a useful big picture. I can see myself writing explanations in the margins, or referencing other articles within the book, or elsewhere, that explain the part I didn't understand in the current article.
So, I'd say it's worthwhile for a beginner, and I'd definitely recommend it. But, he does leave a lot of room for improvement.