Self on Audio, 3rd Edition

Chapter 30Power amplifier input currents and their troubles

(Electronics World, May 2003)

This article grew out of some work that I was doing for a well-known amplifier company. I had produced a nice low-distortion design, which was to a great extent a straightforward application of the Blameless amplifier design methodology described in the Distortion In Power Amplifier series. However, a late change to the specification of the product—a thing not wholly unknown in the world of audio engineering—meant that a resistive network had to be added immediately before the power amplifier stage. The effective source resistance of this network was, if memory serves, 2k2, and when you have perused the following article, you will understand that the bad ...