How Tube Amps Work: Premier Guitar

Premier Guitar August 2013 cover xsm


Happy to have written, illustrated and photographed the cover story of this month’s (August 2013) issue of Premier Guitar magazine. The article gives a part-by-part description of tube amp technology using my favorite amp, a 1960’s Vox AC4. It traces the guitar signal through every component, from pickup to speaker. And it gets into a not-overly-technical description of electrons, current flow and the basic operation of vacuum tubes.

In addition to print, an online version is here:

How Tube Amps Work

Also, if following along here is the original Vox AC4 schematic mentioned in the article.

Special thanks to Mitch Colby ( and Tim Schroeder ( for their technical assistance with the article.

Posted in 2013, Blog.