Pulsar Modular R52 Baxandall v1.0.3 [WiN]

Team R2R | 16 September 2026 | 26.3 MB

这是彼得·巴克桑德尔 (Peter Baxandall) 于 1952 年发表的电路图。1952

年 10 月，《无线世界》(Wireless World) 杂志刊登了一款双旋钮音调控制电路，其均衡网络位于电子管放大器的反馈回路内。业界保留了电路的大致形状，并重新设计了其他部分。R52 代表电路本身：回路中的 SP61 五极管、已公布的元件值，以及巴克桑德尔指定的电路条件，包括源阻抗和远端放大器，现在这些都在您的指尖掌控之中。这是

一个单一的网络，而非两个频段。
低音 (BASS) 和高音 (TREBLE) 是同一个反馈网络的两个分支，因此它们会相互影响。同时提升这两个旋钮，中间部分会后移；同时降低这两个旋钮，中间部分会前移。示波器 (SCOPE) 会显示您调节旋钮时产生的相互作用。

放大器位于均衡器内部。电子管
并非滤波​​器后附加的饱和级。它位于构成均衡曲线的回路中，因此电平是声音的一部分：输入 (INPUT) 决定了您听到的电子管效果，而提升高音旋钮会使电子管精确地作用于您提升的位置。安静时声音干净，响亮时声音有染色，两者之间没有削波点。

这些条件尽在你的掌控之中。1952
年，音源阻抗和远端放大器的性能完全取决于你当时使用的硬件。R52 将这些参数显示在面板上。SOURCE 设置输入到网络的信号源，LOAD 设置放大器对 15 Ω 监听音箱的驱动力，SHELF 则用于选择 Baxandall 公布的两种高音输出模式。

更新日志：v1.0.3（2026 年 9 月 16 日）- 用户指南 v1.0.3（英语、德语、日语）

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.

One network, not two bands.
BASS and TREBLE are two arms of one feedback network, so each changes what the other is working against. Lift both and the middle steps back; cut both and it comes forward. The SCOPE draws the interaction as you move.

The amplifier is inside the EQ.
The valve is not a saturation stage bolted on after the filter. It sits in the loop the curve is made of, so level is part of the sound: INPUT decides how much valve you hear, and a treble lift works the valve exactly where you lifted. Quiet is clean, loud is colored, and there is no clipping point in between.

The conditions are under your fingers.
In 1952 the source impedance and the amplifier at the far end were fixed by whatever hardware you owned. R52 puts them on the panel. SOURCE sets what feeds the network, LOAD sets how tightly the amplifier grips a 15 Ω monitor, and SHELF chooses between the two treble endings Baxandall published.

Changelog:

v1.0.3 (16 September 2026)
– User guides v1.0.3 (EN, DE, JA)

https://www.pulsarmodular.com/product/r52-baxandall/