First, let me apologize for using the word "ampliophile", but I couldn't resist.
I loved this book, read it from cover to cover, and use it almost daily as a valuable resource.....however, I can see where it might not appeal to someone with only a casual interest in vintage amplifiers, perhaps looking for something to lay on the coffee table to appear "hip" when their (grand) children's friends visit.
The photographs are wonderful, but much of the text is admittedly rather esoteric and technical, delving into the circuit design of each amp ("A look inside the 5E9-A displays 5E3-related elements such as a split-phase cathodyne inverter, cathode-biased 6V6's, a 5Y3 rectifier, and the three 16uF filter caps on the left of the eyelet board.....") and the author uses rather abstract terms to describe sound and performance: "warm, dark, woody, etc." that may be reminiscent of an evaluation by a wine taster, and may not make much sense to someone who is simply nostalgic about old amplifiers. To those of us who actually restore and collect old amps, however, the technical insights are manna from heaven.
That said, the book offers significant rewards to all readers. Many of the photos are inside-views of the cabinets and chassis, with close-ups of the circuitry, speakers, cabinet labels, etc. that are simply not available elsewhere. The text, while somewhat forbidding and technical at times, offers wonderful insights into the evolution of guitar amplifiers, their use by famous musicians, and the unique characteristics of each amp. These photos and stories more than compensate for any technical pedantry and, in my opinion, make this book an absolute must for anyone with any level of interest in vintage guitars, amplifiers, and the performers who so ably used them to create the musical heritage we all hold so dear.