U.S. Patent awarded for VAC iQ Continuous Automatic Bias Circuit

On June 10, 2014 the U.S. Patent Trademark Office (USPTO) awarded patent 8,749,310 for the VAC iQ circuit. This is the only automatic bias circuit capable of holding steady the true underlying DC idle point of the output tube (or transistor) in the presence of varying musical signals. It’s quite a breakthrough, and the results are, somewhat surprisingly, quite audible.