R52 Baxandall v1.0.0 macOS
MORiA | 12 September 2026 | 125.8 MB
R52 Baxandall The 1952 circuit, as Peter Baxandall published it.
In October 1952, Wireless World printed a two-knob tone control with the EQ network inside a valve amplifier’s feedback loop. The industry kept the shape and redrew everything else. R52 is the circuit itself: the SP61 pentode in the loop, the published component values, and the conditions Baxandall specified around it, source impedance and the amplifier at the far end, now under your fingers. R52 is a revival, not a revision. Peter Baxandall published the design in Wireless World in October 1952, and what began on those pages became one of the most influential circuits in audio. Yet, the industry adopted only its shape, redrawing the circuit to fit commercial realities rather than the conditions Peter specified.
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