The circuit is a form of the so-called ``Americanized` version of the Baxandall negative-feedback tone control. At very low frequencies, the reactance of the capacitor is large enough that they might be considered open circuits, and the gain is controlled hy the bass potentiometer. At low to middle frequencies, the reactance of the 0.03-J
Ic-preamplifier-tone-control - schematic

This process continues until the ·10-KO resistors, which are in series with the bass pot, become dominant and the gain levels off at unity. The action of treble circuit is smaller and becomes effective when the reactance of the 0.003-J

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