I drew this a few years ago for “The Opus of Amateur Radio Knowledge & Lore,” an excellent book by my friend Eric Nichols, KL7AJ. It visualizes a chapter title about vacuum tubes — yes, vacuum tubes — that explained them and a lot of other stuff with intelligence and style.
In fact, the whole book is like that; it explains not only how to be a ham, but also why to be a ham. If you haven’t fired up your rig in awhile (and if you have only a tube rig, we’ll assume it’s been awhile), you’ll want to after reading “Opus.” I know Eric’s text inspired me to get back on the air and enjoy the hobby after too much time bruised by its club politics and not enough time just playing radio.
The book is already in a second printing, this time with extra material by the inimitable Gordon West, WB6NOA. It’s also available at your better candy stores (I know our Atlanta-area Ham Radio Outlet carries it). I highly recommend this book.