I like to judge a book a little bit more by its cover. "Amplifier Build Notes and Observations" is just a little weak to me. Guitar amplifiers? Musical instrument amplifiers? HiFi amplifiers? Very heavy on components and not so much on build notes. I looked through it and frankly, I'd call it "Guitar Amplifiers: Components, Tool, and observations". (Go ahead and use that if you want ) Good job, by the way.