Re: Tone Controls
The incorporation of the baxandall circuit into a power amps's feedback network was just that, the tone controls varied the feedback transfer function to create the wanted closed-loop response.
The Armstrong circuit above looks similar but is quite different in operation. The Baxandall circuit in this case is entirely in the forwards path of the amplifier and is completely enclosed by the feedback loop.
With a Baxandall tone control AS the feedback system, the gain of the amplifier is controlled by the tone control.
With the Baxandall tone control connected as part of the amplifier's forwards path, the amplifier's feedback acts to control (override) the tone control.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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