The producer's guide to the Pultec EQP-1: "Its beauty lies in the the extraordinary character you get when you disobey what you’re told to do by the manual!"

This 1950s EQ is still one of the most in-demand processors around, so much so that you can find many (many) hardware and software emulations. But just why is the Pultec EQP-1 such a revered machine?