Link is to the index page for the English translation of the digital version. The original German-language hard-copy is sadly out of print now, and included a few figures and explanations that were excluded from the digital copy. The author, Manfred Zollner, also recently released another book, Physik des Magnettonabnehmers, about guitar pickups which takes advantage of recent advances in computer simulations to better model them, but it is/was only available in a German-language hard-copy.
He starts with a comparison to a solid-state FET, which may be most useful to "assist the solid-state-expert" but the discussion gets less technical from there and ends up recognizing some of the superstition that has persisted to muddy the waters into the 21st century.
I could go a little further on this little topic and it may clear up a little superstition if there is any interest.
