ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,525,936, issued on Jan. 13.
"Tube amplifier" was invented by Stewart Lovece (Brooklyn Heights, Ohio).
According to the abstract* released by the U.S. Patent & Trademark Office: "An amplifier circuit including a first stage, second stage and output stage. The first stage includes a cathode biased triode. The amplifier circuit includes a second stage having two long tailed pair triodes, each of the second stage tubes output signals inverted from each other wherein the long-tailed pair triodes are direct current coupled to the output tube's grids, Each cathode biased triode section is direct current coupled to one of the two long tailed pair triodes. The output stage includes two output...