“Do you actually believe that?”, the silicon purity police shriek. Well, as a matter of fact, I do, and I currently use a 40 watt per channel tube amplifier I built from a kit more than a decade ago. It's a classic ultra-linear design using EL34 output tubes, and it sounds much better than the 200 watt per channel solid-state amplifier it replaced (after the silicon went up in smoke).
This book will introduce you to vacuum tube circuitry, and those accustomed to solid-state designs may be amazed at how few components are needed to get the job done. Since every component in the signal path has the potential to degrade its fidelity, the simplicity of vacuum tube designs is one of the advantages that recommend them. A variety of worked-out vacuum tube designs are presented, either to be built by the hobbyist or as starting points for original designs, and detailed specifications are presented for tubes widely used in audio gear.
The production quality is what we've sadly come to expect for inexpensive Kindle-only books. I noted more than 40 typographical errors (many involving the humble apostrophe), and in the tube data at the end, information which was clearly intended to be set in columns is just run together.
This book is available only in electronic form for the Kindle as cited above, under the given ASIN. No ISBN has been assigned to it.