ALEXANDRIA, Va., July 23 -- United States Patent no. 12,368,416, issued on July 22.
"Audio amplifier with switchable active components" was invented by Christian Jennings (Toledo, Ohio).
According to the abstract* released by the U.S. Patent & Trademark Office: "An audio device for amplifying an audio signal enables a user to instantly switch between two or more active amplifying components, thereby allowing the user to evaluate the effect of a particular active amplifying component in the audio device. In one example, the audio device is an audio vacuum tube preamplifier, and has a circuit configuration that facilitates A/B comparison between two or more preamp tubes by hot switching between preamp tubes in the audio signal path. The inp...