The James is one of the more common Bass / Treble controls, most often found in hi-fi, or amps that aren't Fender or Marshall... although they did use them on rare occasions. Perhaps the most well known example is in Orange amplifiers and some Ampegs. It was used in the Marshall Artiste, and a blonde Fender Twin (6G8).
It's hard to mention James without Baxandall - same same but different, so it will not be included in this post. The original Bax is an active control designed for hi-fi - it is incorporated into a gain stage. The James predates the Bax by a few years and is a passive circuit (1949 for James vs 1952 for Bax).
It's a simple design that leaves the mids mostly alone and the bass and treble controls work independently of one another (for the most part). Think of it as two tone control operating in parallel. Ignore RIN and RL - these are the loads of the stage either side of the tone controls.
ORANGE, GRAPHIC MKII
AMPEG B15
FENDER TWIN, 6G8
MARSHALL ARTISTE
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