This one was a page turner for me, if you want to go back in time for audio or radio here's a representative page of RDH4 from 1957: https://archive.org/stream

This one was a page turner for me, if you want to go back in time for audio or radio here's a representative page of RDH4 from 1957: https://archive.org/stream/RadioDesignersHandbook/LangfordSmith-RadioDesignersHandbook#page/n269/mode/2up https://archive.org/stream/RadioDesignersHandbook/LangfordSm... Wouldn't have been possible without a slide rule. Then after basic magnetic circuit theory & transformers, there's a whole chapter of math reference, ends up where they wish they had computers: https://archive.org/stream/RadioDesignersHandbook/LangfordSmith-RadioDesignersHandbook#page/n343/mode/2up https://archive.org/stream/RadioDesignersHandbook/LangfordSm... Which you are expected to be fluent in before you go forward from there. Through the remainder of this handy little 1540-page guide, enjoy 'em all.