A Three-Channel Tube-Based Guitar Preamplifier

Peter Delos details how to add tone controls to a three-channel tube-based guitar preamplifier. The circuit is a versatile building block anyone can use for his or her own preamplifier applications. The project is implemented with three 12AX7 gain stages. The tone control at the final output is a standard bass, mid, treble control circuit found in many guitar amplifiers. This article was originally published in audioxpress, October 2014

Our October edition of audioXpress is full of great articles on current topics and trends in audio electronics, acoustics, and technology innovations. Our October cover story highlights the start of a new series on Wireless Audio. In another timely topic, our usual “Speakers” column turns to the fascinating subject of “Audio for Mobile Devices.” We review NUGEN Audio’s Loudness Toolkit Bundle and Rick Silva from Audionamix explains audio source separation using its new software, ADX TRAX. For our DIY audio readers, we bring you a shunt-type level control project, a one-of-a-kind guitar amplifier and tone controls for a three-channel tube-based guitar preamplifier.