This paper outlines the procedure for the effective modelling of a complex analogue filter circuit. The Fender Bassman 5F6-A is a circuit commonly employed in guitar amplifiers to shape the tonal characteristics of the amplifier output. On first inspection this circuit may look rather simple, however the controls are not orthogonal, resulting in complicated filter coefficients as the controls are varied. This in turn can make the circuit difficult to analyse without the use of mathematical emulation tools such as PSPICE or MATLAB. First the circuit is described, a method of analysis is proposed and general expressions for continuous-time coefficients are given. A MATLAB model is then produced and the frequency responses of which are shown.
翻译：本文概述了对复杂的模拟过滤器电路进行有效模拟的程序。 Fender Bassman 5F6-A是吉他放大器常用的电路,用来塑造放大器输出的孔径特性。在第一次检查时,该电路看起来可能相当简单,但控制不是正向的,因此随着控制方式的变异而导致过滤系数复杂。这反过来又会使电路难以分析,而不使用诸如PSPICE或MATLAB等数学模拟工具。首先,对电路作了描述,提出了分析方法,并给出了连续时间系数的一般表达方式。然后制作了MATLAB模型,并显示其频率反应。
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